I am surprised to learn that the mast rides on the pin. In the only video I have seen of an operating tabernacle (NordSea 27) the pin seemed to function as a pivot and the mast base came to rest directly on the tabernacle's base plate, on the deck. The pin is still in place and I am sure helps secure the base of the mast, fore and aft, but the pin rides in a slot in the tabernacle so it can move up as the leading edge of the base of the mast (partially cut away to reduce this radius) rotates through the 90 degree sweep as it rises. I did not understand that in the vertical position the load was entirely on the pin.
Could you share a photograph of your mast's base?
As I said the pin is very hefty, it would easily support the entire boat without bending!
I don't currently have a photo of the tabernacle, and I've been in California for most of the past month. However as soon as I make it home I'll get a picture. Might be a couple of weeks yet.
Gary H. Lucas