I can assure you that there are no marking on the screws of Parker lock assemblies. Or on the lock plates themselves.
There are 4 screws and one threaded post. Of the 4 screws, on is a shorter length (for the sear spring). The other 3 are the same length. One of which is visible from the outside so it has a finished end. The other two are hidden behind the hammer and the ends are a rougher flat end.
Those are the only real methods of telling which screw goes where.
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B. Dudley
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