by straightshooter » 02 Oct 2023, 7:26 am
Thread standards did not become truly established until the late 1800's and early 1900's.
The No.1 used thread forms unique to, surprise surprise, the Enfield factory. This can cause a problem when a standard thread is not a good fit or in reproducing small fasteners for models such as these when the original is lost or damaged or unprocurable.
This is not a major problem with machining a barrel tenon as slight variations in form are compensated for by machining and test fitting to a 'neat' fit.
The No.4 used mostly a BA thread form even when made in the US.
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