Dean - those threads would definitely need to be cut down below the minor diameter.
I am surprised to learn that this is a common problem with the Reproductions. (Thanks Brad)
All of the dovetail clearances between plate and bbl are nice and tight on all of mine..having said that, I do ensure that the retaining screw is adequately snug whenever I do an annual clean-up following heavy use through the season.
Following an initial cleanup to remove old grease/gunk, rarely, if ever do I tap the stop plate in/out in order to keep the fit nice and tight...maybe I'll check the retaining screw more often.
Sam..you might also clean everything up really well paying particular attention to the internal thread of the plate and see if the screw will freely pass through end for end..if not, you may want to get yourself a tap along with an extra screw or two provided you find them. Wish I could tell you what size but am not near my safe at the moment..maybe Brad can advise?
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For general guidance - if the plate is ever removed from the dolls head..I would advise paying very meticulous attention when re-installing it to ensure it is wedged in nice and straight before driving it home by tapping very lightly using only brass punches..ideally the punch would have a small radius on the face. I also prefer a small & light brass/copper hammer when doing this sort of thing.
That "feature" is particularly delicate to a degree and susceptible to damage....questionable design for the home hobbyist to work on (which I don't think was Parkers intent), but I likes it!
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