Fixture to hold a red laser diode at the correct angle to show where the laser will cut.
You may need to pass a 6mm drill-bit through the angled hole if it's too tight.
Also, tap the hole in the side, 4mm, this is for a set screw..
I found it necessary to glue the threads of the lens on the diode to make it steady
The holes for the screws in the top are designed for 3mm taper-head screws.