[quote=Dogboy][quote=antonlargiader] Same extrusion as one or two other Hobies, like the 18 and maybe the 20.[/quote]
Definitely not the same extrusion as the 18 or 20. The Hobie 21 mast is a much larger cross-section than the mast used on either of those boats.
The only boat that used the same extrusion was the Hobie 21SC which was a shorter version of the standard 21 mast.
There may be a mast from another boat (another brand) that would work, but you're talking about a lot of searching and customizing to make it happen. Either way, I would definitely source a mast before buying that boat or you're going to end up with a useless platform. Sounds like a parts boat to me.
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