Chuck:
I assume what you really mean is an "un-buggered screw." It is possible to remove Parker screws without destroying the slots -- but it takes education and a proper turnscrew to do it.
And... the bottom plate you show is virtually clean compared to some Parkers I've taken to bits! Still, they should all be treated to a strip-and-clean every few years as you say. Thanks for sharing your wisdom.
Best, Kensal
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