§ 01
System Summary
0tools
Required to clamp a knife
2side
Independent micro-angle adjustment per side
7075T651
Duralumin — aerospace grade
∞play
Zero play throughout the mechanism
The KMFS MOA21 is the flagship of precision mechanics — a fully tool-free symmetric sharpening system with revolutionary self-centring clamping. A central knob drives an internal synchronised mechanism pulling both jaws symmetrically toward the centreline — the blade is always centred exactly regardless of thickness. Each arm features independent micro-angle fine-tuning, invaluable when reproofiling knives with asymmetric factory bevels. All parts CNC-machined from solid billet 7075 T651 duralumin. No plastic structural elements.
§ 02
Hardware Components
Self-centring Vice
Tool-free symmetric clamping via central control knob
+
MaterialDuralumin ENAW 7075 T651
SurfaceHard colour anodising
OperationCentral knob — no tools required
Jaw synchronisationInternal gear / lead-screw mechanism
Max. blade thickness~5 mm spine
Blade orientationEdge facing upward
The internal mechanism ensures both jaws always travel symmetrically toward the clamping axis — the blade is centred precisely regardless of thickness. No Allen key, no tools.
Arms with Guide Rods (×2)
Duralumin arms with stainless guide rods and bronze bushings
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Arm materialDuralumin ENAW 7075 T651
Rod materialStainless steel
Bushing materialBronze (self-lubricating)
PlayZero
MotionLinear along blade length
Each arm carries stainless guide rods running in bronze bushings — corrosion-resistant, self-lubricating, built for zero play.
Micro-angle Fine-tuning Element (×2)
Independent rotating elements for per-side bevel correction
+
OperationRotating element on each arm's guide rod
IndependenceLeft and right sides adjustable separately
Use caseCorrecting asymmetric factory grind
If a knife has a slightly asymmetric factory bevel, the MOA21 can correct it precisely by adjusting each arm independently. This feature has no equivalent among comparable systems.
Rotating System Head
Full head rotates to second side without re-clamping the knife
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RotationRelease locking element + rotate
Position precisionIndexed — locks in exact position
Re-clamping neededNo — knife remains clamped throughout
After sharpening one side, simply release the locking element and rotate the entire head — knife and all. Nothing is re-adjusted.
Stone Holders (×2)
Flip-lock quick-release — grit swap in seconds
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Locking mechanismFlip-lock quick-release
Stone formatStandard KMFS paddle
CompatibilityAll KMFS Rival / MOA21 stones
The flip-lock system allows grit changes in seconds. All KMFS stones share identical thickness — no angle re-setting required when swapping grits.
Bench Clamp
C-clamp for secure mounting to any bench or table edge
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TypeC-clamp / G-clamp
MaterialDuralumin / stainless hardware
Contact padsRubber (surface protection)
Secures the system firmly to any bench edge. Rubber pads protect the work surface from scratching.
§ 03
Self-centring Mechanism — Comparison
| Property | MOA21 | Standard sharpener |
|---|---|---|
| Knife clamping | Central knob — no tools | Allen key / screw required |
| Blade centring | Automatic — synchronised jaws | Manual — operator-dependent |
| Blade thickness | Any — compensated automatically | Fixed or limited range |
| Independent side adjustment | Yes — each side separately | No |
| Switching to second side | Rotate head — no re-clamping | Re-clamp knife required |
| Mechanism play | Zero (CNC from solid billet) | Variable |
§ 04
Sharpening Angles
15°
Japanese knives
17.5°
Premium kitchen knives
20°
Standard kitchen / pocket knives
22.5°
Hunting / robust blades
Angle can be fine-tuned independently per side — essential for reproofiling knives with asymmetric factory bevels. Values are per-side; full included angle = 2×.
§ 05
Abrasives (included in box)
| Grit | Type | Surface | Qty | Phase |
|---|---|---|---|---|
| 240 | Diamond | DLC | 2 pc | Reproofiling / heavy material removal |
| 600 | Diamond | DLC | 2 pc | Bevel refinement / burr formation |
| 1000 | Diamond | DLC | 2 pc | Final sharpening / burr removal |
| 3000 (optional) | Ruby stone | — | 2 pc | Polishing / mirror edge (sold separately) |
DLC = Diamond-Like Carbon coating. All stones share identical thickness — no angle re-setting when swapping grits. Stones used dry.
§ 06
Materials Overview
| Component | Material | Grade / spec | Surface finish |
|---|---|---|---|
| Vice body / chassis | Duralumin alloy | ENAW 7075 T651 | Hard colour anodising |
| Arms (×2) | Duralumin alloy | ENAW 7075 T651 | Hard colour anodising |
| Rotating head | Duralumin alloy | ENAW 7075 T651 | Hard colour anodising |
| Guide rods | Stainless steel | — | As-machined |
| Jaw synchronisation mechanism | Stainless steel | — | As-machined |
| Guide rod bushings | Bronze | — | As-machined (self-lubricating) |
| Diamond stones (×6) | Diamond abrasive | DLC coating, grit 240/600/1000 | DLC coating |
| Carrying case | Plastic (PP) | — | Shaped foam insert |
§ 07
Package Contents
| # | Item | Qty | Note |
|---|---|---|---|
| 1 | KMFS MOA21 sharpening system (assembled) | 1 | Vice + self-centring mechanism + arms |
| 2 | Stone holders | 2 | Flip-lock, one per arm |
| 3 | Bench C-clamp | 1 | For mounting to workbench |
| 4 | DLC diamond stone, grit 240 | 2 | Coarse reproofiling (1 per side) |
| 5 | DLC diamond stone, grit 600 | 2 | Bevel refinement (1 per side) |
| 6 | DLC diamond stone, grit 1000 | 2 | Final sharpening (1 per side) |
| 7 | Carrying case with shaped foam insert | 1 | Secure storage of all components |