Swinging arm pivot

[T6xc]

Hi ,can anyone tell me what the thread is on the swinging arm pivot for. 1960 Scottish.cheers john

[garybam4711]

And size 7/16 bsf

[John Wakefield]

Someones not right as 7/16 BSF is 18 tpi need to look up the drawing

[T6xc]

Hi thanks for all replies I checked tpi today at 18 so looks like bsf ,thanks