I made a camera mount for my microscope and II needed a short 3/8-16 thumb screw. I've included the .SKP file if you want to modify it.

BIBO2 Touch Dual Extruder X Laser

Yes

No

200 um

20%

I like using a brim to help hold the part down to the glass bed. This may not be necessary on your printer.

Clean the hex head of the bolt, apply a small amount of CA glue inside the thumb cap and press the bolt in with a vise.