You have some work ahead of you Sean. Keep the penetrating oil away from the wood as much as possible. I suspect it will free up eventually if you're patient. We have a saying on the forum here that when working on Parkers we try to "do no harm", which means being very patient, not forcing anything prematurely, and having the right screwdrivers such as the Brownell set mentioned. Just take your time and you'll likely have it open soon enough. I suspect it will take a lot of soaking to get the side lock plates off when the time comes. Keep us up on your progress; everyone here loves stories on projects like yours...
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