Knurled thread protector for Ruger 22/45

I've used the thread library from Dan Kirshner (http://dkprojects.net/openscad-threads/) and aubenc's knurled surface library to make this thread protector for my .22, a Ruger 22/45. It's not as good as the original, obviously, but it should get you by until you buy a new one.

This should work with any 1/2-28 threads.