The basic Idea is to attach your bench grinder, vise, miter saw, Belt sander, etc. to a board that you can freely clamp to your workbench.
Step 1: Mark and drill holes.
Get the correct length bolts and countersink them in the bottom so it will be flush with the workbench. I used a large drill bit and chisel to get the right space for the counter sink hole.
Step 2: Test the fit
Some ideas, I've not tried yet, Epoxy the bolts once tested. Add some padding to the bottom of the board.