swinging arm spindle threads

[Chris]

Hi

Anyone know the threads in the swinging arm pin? dont know if its 750 or 850 or even if that makes a difference?
The centre holding thread & also the extraction thread.

Thanks Chris

 

[L.A.B.]

1/2 UNF.

 

[Ron L]

Extraction thread - 1/2-20 (UNF)
Central fixing bolt - 1/4-28

 

[Chris]

Hi

Thanks Guys

Chris