Im kinda new to the site, posted one message and got busy doing work stuff, I restore military equipment, and as a conversation piece I am attaching a photo of my current project to see if anyone has ever restored
a rear sight for a BMG 50 cal heavy machine gun, I actually broke one when adjusting elevation, I think it was just rusty in the frame bore and went south.
The thing looks like a micro acme thread but spiral, I have never seen one of these taken apart? If any one has any idea as to what TPI it is please let me know.
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And yes, this Quad mount 50 is fully functional as the day it rolled out of the factory, all guns fire, the turret elevates, tracks, traverses and fires 2,400 rounds per minute!