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Safety fitted. Found that cocking piece hitting the safety lever screw head, so I machined a recess for the screw head. Cocking piece accommodates the screw head, but not hits the safety lever along...

I got rid of the gap with the countersink, but now have to modify the lever and remove material where it interferes with the bolt...

It’s about 10 thou. I think the cocking piece is going to need to be ground so that it doesn’t hit he head of the screw on the new safety when uncocked, and upon firing.

Mine still works on both stages. Have you figured out what is wrong with yours?

Thanks everyone. I’ll dig out the dremel later and massage the safety lever into place.

Countersunk. That has accommodated the radius and closed the gap, but there is still the overlap in the first image above. More work required.
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Mounting a scope with low rings on my Mauser meant that I could no longer apply the safety, as the safety lever is blocked by the scope. Solution was to buy one of these Timney low profile safeties....