Need Help:1943 Bell & Howell Military Bore Sighter

[upcondor]

Just acquired the above equipment. It is a US Military issue bore sighter for .30 cal, .50 cal, 20mm, and 37mm. It is in excellent condition. Unfortunately it came with no instructions or (TM) technical manual. It is being used as a conversation piece but I still have the need to know exactly how it was used on the various weapons.

If anyone possibly has a copy of the US Military instructions please let me know. It would be greatly appreciated.

Thanks