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if you have a first gen its not as much of a concern and it is located in the timing case. the pin falls out and falls into the gears and destroys everything. hope this helps
I got lucky and I know the original owner and he did the fix in 1995, I also know the kid i bought it from a few years latter and he has not had the cover off. Iam planning on a teardown just to make sure every thing is OK.