Apparently I need the Drum Screw #4532 according to this drawing, I can't even find this info on US Spars website. Thanks for your help, I'll see if I can find a rigger who might be able to find one. US Spar says they are working on a replacement but who knows when I might be available, if at all.Welcome to the forum!! So you need part #3001 from the attached parts manual shown on page 8? One option that comes to mind is to check with a local rigger who handles US Spar masts on thoughts on a replacement.
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