If the origanol stuff is still working you can simply drill a hole thru the mast and round slug to hold it at a fixed height. I think i used a 3/16 Clevis pin of the correct length. Secured with a ring ding. Very simply to remove boom for travel.
On my boat, The mast portion of the slug is still in fine shape after all these years, but the u shaped part that attaches to the boom went bad. I made a new one with square aluminum , a drill press, and a lot of hack sawing. It is twice as strong as the origal. I think it was made from 1 inch square aluminum stock, maybe bigger