Mine is a 59 and the 59 shop manual doesn't mention a word about this. The engine rebuilders that didnt know either have good reputations around these here parts.
So if you were me, would you take about a 3/8" oak dowel and a hammer and whack that sucker a bit to see what resistance you run into, or go with Griggs advice, which means finding a new pin or fabricating one. Before I do that, I sure would like to see what one looks like? I dont even know how far it goes in, or out.
We have more information tonight than we had last night for sure. Wish I had just a LITTLE bit more before messing with Precious!