Just opened a box of the above Qty- 10.

Contents are:-
8 without threaded spline circa .270 dia
1 without threaded spline circa .366 dia
1 with threaded spline circa .266 dia

Is this a 'standard contents' if so, why?

My two Nr 4s both have the threaded spine bolts.

How did the non-threaded items drive the safety catch?

Regards

John
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