Knew Concepts 3" Mk.IV Heavy Duty Fret Saw – Lever Tension & Swivel Clamps

Take precision sawing and piercing to another level with the Knew Concepts 3" Mk.IV Heavy Duty Fret Saw with Lever Tension and Swivel Blade Clamps. Combining the rigid, high-tension Mk.IV frame with rapid cam-lever blade tensioning and 360° rotating blade clamps, this premium saw gives jewelers, metalsmiths, and precision craftspeople exceptional control over both blade tension and cutting direction.

The heavy-duty Mk.IV frame is designed to apply 50–60 pounds of blade tension, helping reduce blade vibration and creating a rigid, responsive feel while cutting. The cam-lever tensioning system makes repetitive blade changes fast and convenient, especially during intricate piercing work.

What sets the 124.003CS apart is its swivel blade clamp system. The clamps rotate through a full 360° with positive click stops every 45°, allowing you to change the direction of the blade without changing the orientation of the entire saw frame. This gives you greater freedom when cutting large sheets, working around obstacles, or sawing under an Optivisor or other magnification.

Features & Benefits

• 3" throat depth for jewelry, piercing, and precision sawing
• Heavy-duty Mk.IV frame for increased rigidity
• Designed for 50–60 lb of blade tension
• Higher tension helps reduce blade vibration
• Cam-lever tensioning allows fast, repetitive blade changes
• Excellent for intricate piercing and interior cuts
• 360° swivel blade clamps dramatically expand cutting flexibility
• Positive 45° click stops make blade positioning repeatable
• Rotate the blade while moving the saw frame away from obstacles
• Makes it easier to work along the edges of larger sheets of metal
• Helps keep the frame clear of an Optivisor or magnifying headpiece
• Lightweight compared with a traditional heavy steel saw frame
• 185.5 g weight with blade
• Durable red finish
• Premium Knew Concepts precision saw
• Made in the USA

Specifications

The 185.5 g weight and exact 124.003CS model designation come directly from Knew Concepts' saw-weight specifications.

360° Swivel Blade Clamps

The defining feature of the 124.003CS is the swivel blade clamp system.

Knew Concepts designed the Mk.IV clamps to rotate through a complete 360 degrees, with click stops at 45-degree intervals. Both clamps are rotated to the same position, changing the orientation of the blade relative to the saw frame.

That means the saw frame no longer has to remain directly behind the blade.

You can point the blade where you need it while positioning the frame where it is most comfortable—or where it won't interfere with the work.

Cut Larger Sheets with Greater Freedom

A conventional jeweler's saw is limited by the depth of its frame. Once the workpiece reaches the back of the frame, you can't continue cutting straight ahead.

The swivel system changes that relationship.

Knew Concepts specifically notes that jewelers and metalsmiths can rotate the blade to cut along the edge of a larger sheet, effectively providing far greater cutting depth in that direction.

This can be particularly valuable when working with:

• Larger sheets of metal
• Oversized jewelry components
• Decorative metal panels
• Sculptural metalwork
• Long pierced designs
• Unusual workpiece shapes

Keep the Frame Away from Your Magnifier

Anyone who has done close piercing work under an Optivisor knows the problem: you're following a fine line and suddenly the saw frame hits your magnifier.

The swivel clamps provide a clever solution.

Knew Concepts specifically identifies the ability to swivel the saw frame off to the side while the blade continues cutting straight ahead.

For jewelers who routinely work under magnification, that can make the CS version considerably more comfortable than a conventional fixed-blade saw.

Heavy-Duty Mk.IV Frame

The Mk.IV is Knew Concepts' heavier-duty fret saw design.

It is engineered to pull approximately 50–60 pounds of tension on the blade, making the frame stronger and reducing blade vibration compared with the company's Mk.III saws.

The result is a more substantial, rigid feel while still keeping the overall saw relatively lightweight.

Reduced Blade Vibration

Proper blade tension is critical for precision sawing.

A poorly tensioned blade can flex and wander, making it more difficult to follow fine layout lines and negotiate intricate curves.

The Mk.IV's high-tension frame is designed specifically to reduce blade vibration, giving the blade a more stable and responsive feel during the cut.

That can be especially useful for:

• Fine piercing
• Tight curves
• Detailed patterns
• Straight precision cuts
• Interior cutouts
• Repetitive jewelry fabrication

Fast Cam-Lever Blade Tensioning

The Mk.IV's cam-lever tension system is designed for rapid, repetitive blade changes. Knew Concepts specifically highlights piercing as an application where this system is useful.

That's important because piercing may require the blade to be released and threaded through drilled openings repeatedly throughout a single project.

Instead of completely resetting the blade tension after every interior cut, the lever system lets you release and restore tension efficiently.

Excellent for Intricate Piercing

Combine the cam lever with the swivel clamps and this becomes a particularly capable saw for intricate piercing work.

The lever handles the repetitive blade changes, while the swivel clamps give you more control over how the frame is positioned around the workpiece.

That combination can be especially useful for:

• Pierced pendants
• Earrings
• Decorative panels
• Intricate sheet-metal designs
• Filigree-style patterns
• Detailed sculptural components
• Complex interior cutouts

3" Throat Depth

The compact 3" throat is particularly well suited to jewelry and other small precision work.

You get a manageable, responsive frame without unnecessary depth or weight for projects that don't require a larger 5" or 8" saw.

And because this CS version can swivel the blade, the nominal 3" throat doesn't tell the whole story. When working along the edge of suitable larger material, rotating the blade can allow the frame to remain clear of the workpiece.

Lightweight Heavy-Duty Design

Despite its heavier-duty construction and additional swivel hardware, the 3" 124.003CS weighs only 185.5 grams with the blade installed.

For comparison, Knew Concepts lists the standard 124.003C at 179.1 g, so adding the swivel-clamp capability increases the weight by only about 6.4 grams.

That's a useful distinction for customers deciding between the two versions.

124.003CS vs. 124.003C

Since Micro-Tools carries both, I would make this distinction very clear on both product pages.

Choose the 124.003C if you want the Mk.IV's heavy-duty frame and fast lever tensioning with conventional fixed blade orientation.

Choose the 124.003CS if you also want to rotate the blade independently of the frame for larger workpieces, unusual cutting angles, or improved clearance around magnification equipment.

That comparison would be excellent internal linking between the two Micro-Tools listings.

Ideal For

The Knew Concepts 3" Mk.IV CS is an excellent choice for:

• Jewelry making
• Jewelry fabrication
• Fine piercing
• Metalsmithing
• Silversmithing
• Goldsmithing
• Intricate sheet-metal cutting
• Larger sheet-metal work
• Sawing under magnification
• Model making
• Precision fabrication
• Professional jewelry studios
• Jewelry schools
• Serious hobbyists

Frequently Asked Questions

What makes the 124.003CS different from the 124.003C?
Both use the 3" Mk.IV Heavy Duty frame and lever tensioning, but 124.003CS adds swivel blade clamps.

How far can the blade clamps rotate?
The Mk.IV swivel clamps provide a full 360° of rotation.

Do the swivel clamps have preset positions?
Yes. They have click stops every 45°, making it easier to position both clamps consistently.

Why would I want to rotate the blade?
Rotating the blade lets you change the cutting direction relative to the frame. For jewelers, this can provide better access when cutting larger sheets and allow the frame to be positioned away from an Optivisor or other obstruction.

Can I still cut straight ahead?
Yes. The clamps can be positioned for conventional straight-ahead cutting or rotated when the project benefits from another blade orientation.

How much blade tension is the Mk.IV designed for?
Knew Concepts specifies approximately 50–60 pounds of blade tension.

Is this good for piercing?
Yes. The cam-lever system is specifically designed for rapid repetitive blade changes, making it particularly convenient for piercing work.

How much does the 124.003CS weigh?
Knew Concepts lists it at 185.5 grams with the blade installed.

Is it much heavier than the non-swivel 124.003C?
No. The 124.003C weighs 179.1 g and the 124.003CS weighs 185.5 g—a difference of only about 6.4 g.

Can the swivel feature help when using an Optivisor?
Yes. Knew Concepts specifically describes rotating the saw frame away from the user's magnifying headpiece while keeping the blade cutting straight ahead.

Micro-Tools makes every attempt to provide accurate information for each item. Actual packaging and/or specifications may be slightly different from the information and picture provided.