Id have to drill in the the mast to do that. I mounted a block on the wood base and installed a cleat on the boom. Seems to work just fine. The boom cant really even go out close to 90 without hitting the shroud. I put is out as far as i could and the boom movement vertically is really reduced.
I did have anothe problem today tho. Only about 4-5knots of wind and my mast twisted on me. About 30degrees. I just put new, heavier duty screws in the wood block the goes inside the mast to prevent it fron twisting and it looks like one got sheared off.