Of photos, necks, chiropractors and MS Paint.

[Patrick Chadwick]

Hey JM, that's a very nice example of the Mechanical Engineering Handbook you have there! But maybe not as old as my copy of Machinery's Handbook.
Attachment 49658Attachment 49657Attachment 49656
- which is where I obtain up-to-date information on screw threads for my rifles. At least it was up-to-date when they were made!