Angle stop for a gem facet cutting machine. This is the prototype version. Done on the Artillery Sidewinder at 0.2 thickness, 60 mm/s Use M5 and M3 screws. You will need to redrill and tap the holes. Use 2.5 and 4.2 mm pre-drill.
mini3b2 has more space for the M5 blocking screw head.
Look also at the "Gem facet machine height adjustment" and the "Lapidary" group.