I put these on clamps thingiverse which will hold 1/2" plywood down atop the MDF wasteboard on the Lead Machine. They are more durable than I thought. I'm using them for a week now and have not broken one yet. I made the clamps in several lengths from 30 to 107 mm. Each clamp require 55mm M5 screws, a M5 locking nut, a drop in T nut and a washer. The clamps need 21 mm between the V-slot wasteboard rail and the Y-carrage. Here is the link. V-Slot edge clamps for Openbuilds CNC by martinkc These clamps are also good to use with drop in t-nuts on the Lead machine Reversable Hold-Down for T-Slot Tables by WorksBySolo
