I have the Sht 22 IV with the rear guard screw half broken(half of the head gone). On my .410 No 1 Mk III, I couldn't get the screw loose, and I did try, but stopped before breaking or stripping the head with too much pressure.
I should probably get a few new screws.

Does anyone know if the rear guard screw for a No 4 is the same as for a No 1 Mk III, because I have 2 of those.

I'd almost have to clamp the one screw with vice grips...this is not a fun situation. I think I can do it but who wants to break it off in the hole...

If it does break off in the hole, what would you do then?

I just gave both of them a shot with my new giant aerosol of Break Free CLP...
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