In article . com,
wrote:

The only addition you might consider is a removable (thus replacable)
backer. On the original setup you'll get good backing. However on
subsequent uses the backing will wear down a bit and yoiu may need to
run the cut up a lytllie higher each time so you don't get breakout,
etc.

It's not obvious from the pics, but the backer *is* actually two pieces
of 3/4 ply, with the second piece holding the reference pin and held to
the first by the spring clamps, thus easily removable.