Canopy bolt, RC airplane

Canopy bolt for radio controlled airplane. It is designed to hold a 3mm cap screw. The tolerance is for a pressed fit using a drill press or vise, it's a very snug fit.

If you would like other sizes leave a request in the comments. I made a wing bolt version also. I uploaded two files...one of them is just a cross section so that you can see what it looks like inside. The wing bolt knob is designed for a 4mm cap bolt, 15mm long. It is for my Sebart Sukhoi.