M_Boats: Centerboard stop pin/bolt?

I think I asked this before, but it was probably buried in a long post.  What was the original centerboard stop pin?  Mine is missing.  Everything else looks good; maybe a 5/16 hole through the port side of the trunk/stub keel, and a shallow hole inside the starboard side.  I don't see any signs of threads in there.  Was it a smooth pin that slid in and was secured with a sealer?  Or were there threads originally?  I'm going to put fuel tubing over mine, so maybe that will help hold it in place too?Gerry