Hi das...... can I offer you another solution? I have on two of my yachts fitted this system. Sorry no picture. I use 1/8th inch dia. plastic aileron hinges about 1 1/4 inches long each side of hinge. Standard items in Model aircraft shops.
Drill a hole into the boom and slide plastic hinge in with 3/8ths inch sticking out and hanging straight down. Glue in place. Then fit a 3/4 inch length of tube to mast for the other part of the hinge to rotate in, a fairly close fit.
The boom needs to be held down by the kicking strap. The hinge allows boom to rise and the tube for it to go from side to side.
Paint the tube on the mast the same colour as the mast and you will not notice it.
Has worked well for years and easy to remove boom from mast.
Hope it helps,
I have an Inga lV very nice but rather heavy.
Roy