What threads are damaged? Well to start with only one area. Personally I like to chase the threads trying to clean them out of grease and such stuff. The major problem in the Bren Tripod is the pin hole that is drilled in the end for a couple to pins to be pressed in and the collar and handle going over them of course. As I'm buying surplus sometimes you have small pieces of metal thread or pin pieces or whatever that you might run into. I've been having fun with 18 sets of them. The collar and pin that goes in it at the end of the bolt, I have several that someone else before me really had messed up while taking apart. Looks like they used a long pipe wrench and just took the handles right off. Rip and tear. I've won the fight in 16 and will win the other two. I'm going to replace and throw away parts as it's cheaper to buy and replace things than to pay more for taps and dies and wait 30 days plus to have them shipping in from India.
As far as I can tell the major tap and die needed is the BSF 5/8-14. Measures .625 and thread pitch gauges show 14 tpi. It's used "I believe" for the front and rear legs threaded screws and handles. Only other area is on the mk1 AA front leg handle and screw setup.
If all goes well when I'm done I'll try to post a drawing with all of the thread sizes that I've found out and such. Need to head off to work.
Later 42rockerInformation
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