I remember that the 5.2 used a short piece of 3/4" (roughly) square stainless tubing as a trunion. It had a pin through the top and a pin through the side that attached to stainless yoke fittings in the boom and the mast.

The boom fitting was a "U" shaped bent piece of stainless (15 gauge?) that had a large hole in the middle with a bolt (5/16"? maybe 1/4"?) that went through a plastic end cap in the end of the boom. That "U" shaped yoke could swivel on the bolt and swivel on the pin.

The mast had a fitting that riveted to it and made a yoke with the pin oriented in the vertical axis.

Really, though, gooseneck fittings are a dime a dozen...you could probably adapt just about anything from any sailboat.


Jake Kohl