I just noticed the title of the post and realized I misread it... sorry. I take back what I said about the brake light switch. The rest is appropriate though, your shifter can be disassembled, but you might wish to disconnect the shift rod to see if the shifter still won't shift.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician