Though I have not had to tackle this pob on my 300TD, is it possible the weight or pressure is holding the pin from coming out? Probably not based on your description yet just a thought until someone else chimes in.

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Steve
'87 300TD - 132K - Soon 4-Sale
'84 300D Turbo - 122K - Driving
'77 VW Type II - 77K - Restored
'08 250EX Ninja
English Bulldog (Brier) - My best friend. Passed away 12/02/04 while in my arms.