Tevo Tornado Full Bed Glass / GRP / FR4 holder with strain relief

As the murderously bad glass surface of the Tornado finally cracked and I switched to a full aluminum plate with countersunk holes, I also made these to keep my epoxy sheet on the bed. I hope they might help people who get rid of the stock cheap glass and move to metallic surfaces.

Parts list:
3 mm 310×370 mm aluminum surface (permanent) with countersunk M4 screw holes.
1-4 mm thick 310×370 mm (removable) top surface (glass, GRP, whatever works for you)
4 × 20 mm M4 spacers.
4 × 8-12 mm M