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Old 24-12-15, 13:25
rob love rob love is offline
carrier mech
 
Join Date: Feb 2003
Location: Shilo MB, the armpit of Canada
Posts: 7,517
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That is what the nut is for, along with a flat washer that goes between them. If the holes are not aligned l/r, you end up with a very large cloud of dust and a lot of debris being thrown around.

This muzzle brake example came off one of the 17 pdrs from the Shilo museum. It was not perpendicular before it came off but I can assure you it will be when it goes back on.
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