There really was not any variation in the thread pitch of the trigger plate screws over the years of manufacture. So, I am not sure why you are having issues if in fact the screws you have are for/from a Parker.
I do sell Nearly all of the major action screws for Parkers. As well as the wood screws. I have new trigger plate screws that are high headed with no slots in them so that they can be properly fitted. I do also have some New old stock trigger plate screws from the factory that have slots in them and are slightly high headed. These need to be filed under the head to properly qualify them.
$5ea for my new ones and $10ea for factory NOS.
There really is not any point in messing around with trying to put used screws into a gun since they nearly never fit properly. I sometimes do it, but that is because I have over 100 used screws that I can pick through to maybe find a couple that fit the gun that I may be working on.
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B. Dudley
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