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It would benefit you to read through this thread... it will have a lot of IP tips and documents that are useful to you:
https://www.steelsoldiers.com/threads/new-to-mep-803a-ownership-general-questions.218700/
I've always been able to soak them whole in a coffee can (with lid) submerged in https://www.napaonline.com/en/p/NCB0996 . If whole doesn't work, yeah just disassemble as others have said.