D&R Marine or Cape Cod Shipbuilding
I'm not sure if he has one, but I'd give our friend Rudy a call at D&R Marine (508) 644-3001. He has a few "old" O'Day parts laying around in addition to the new stuff he makes.The other option is to give Cape Cod Shipbuilding a call (508) 295-3350. They make a paddle/boom crutch for the new Day Sailers that they build, it should work for the Javelin as well. The Goodwins at CCSB are familiar with many of the O'Day boats as well as their own, and in fact Cape Cod's spar division, Zephyr Products used to supply masts for some O'Days.