Paul, I suspect you may have already tried this, but this is how I do it.
- Lay a straight edge (i.e combination square, etc.) across & perpendicular over the trailing end of the insert near the set screws.
- Using a flash light, direct its beam towards you ,i.e. the front of the saw, while looking at where the straight edge is over the template.
- Use the set screws to lower both sides of the template so that light can be seen from the flashlight.
- Repeat for the leading edge of the insert.
- At this time all four "corners of the template should be lower than the straight edge.
- Now adjust each set screw to raise each corner until the light from the flash light "just disappears".
- The insert should now be flush with the table at each corner.
Unless I'm using the insert to establish the depth of cut on a narrow/short piece, I actually prefer to have the leading end of the insert just a touch lower than the table & flush or just a touch higher on the trailing end. This prevents any "catching" as the wood passes over the insert.
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