Betterley Tru Cut Zero Clearance Insert — and the Amazon Alternative
A zero-clearance insert stops tear-out and stops offcuts falling into the saw. Betterley sells direct; the fix is mostly shop-made anyway.
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Betterley Industries sells its inserts direct and through specialist retailers rather than Amazon. The good news is that the best version of this upgrade is one you make.
What a zero-clearance insert fixes
The standard throat plate has a wide slot so the blade can tilt. That gap means two problems.
Tear-out. Fibres on the underside of the cut have nothing supporting them as the teeth exit, so they splinter. An insert with a slot exactly the width of the blade backs the cut right at the teeth, and the difference in veneered ply and melamine is dramatic.
Offcuts falling in. Thin strips drop into the gap, get caught by the blade and get thrown. This is a genuine hazard, not just an annoyance.
Making one
Buy or cut a blank insert to match your saw’s opening. Lower the blade fully, fit the blank, and clamp a board across the table to hold the insert down. Switch on and raise the blade slowly through the insert.
The slot is now exactly your blade’s kerf, at exactly your blade’s angle. It takes ten minutes and the material costs almost nothing.
Make one per setup: one for the general blade at 90 degrees, one for 45 degrees, one for the dado stack.
Adding a splitter
This is the step that turns a convenience into a safety upgrade, and it is what the product scored here does.
A short steel splitter set into the insert behind the blade keeps the kerf open as the board passes, which is the mechanical cause of most kickback. Because it is shorter than full blade height, it does not interfere with grooves or dados — so unlike a factory splitter, it stays fitted.
Match the splitter to your blade kerf. Full kerf behind a thin kerf blade binds; thin kerf behind a full kerf blade leaves the cut unsupported and does nothing useful.
What works
- Fitting a splitter into a zero-clearance insert gives you tear-out control and kickback protection in the same part
- The splitter sits below the top of the blade, so it stays in place for grooves and dados rather than being removed and forgotten
- Cheap enough that making an insert per blade setup is realistic
What doesn't
- You still have to make the insert — the splitter is the easy half and the accurate hole is the work
- Full kerf and thin kerf splitters are different parts, and fitting the wrong one either binds or does nothing
- One insert per blade setup means several inserts, each needing its own splitter