After a bit more thinking, some universal T-bolts for the rip miter fence make more sense than fixture blocks.
The two big slots in the rip fence and the miter fence and the front and rear rails are sized to take 1.00 inches wide x 1/8th and 1-1/8" wide x 1/8th.

So I took some 1/8th flat Aluminum 1.00 inches wide and cut 1-1/8" long to make a 1" x 1-1/8" rectangular plates; I used a short rip fence Block to space the length but not cause a kickback with the...

Whilst cleaning up I found an old BT3central post by ejs1097 I printed out from a while back. I had forgotten about it.


I made some changes and whipped out a few in a couple of evenings.
What I liked about them was they hold the sandpaper tight and snug, the bought ones the paper works loose and sags and gets caught and tears.
Also easy and cheap. Also has a square end for sanding into corners and a radius to do curves. I did modify the block so it used thicker stock...