unbusted67 If you're a yacht club member
somewhere, often you can use such for reciprocal privileges at other clubs. And there are a large number of "dinghy" classes
which are dry sailed via the YC's crane. Said boats range well into the 30' range, so you might be able to use these for a spar fix.
On rubber blocks, you might just be able to find out how hard the ones which you have are (on the shore scale), & then pick up some rubber blocks from an industrial supplier & make your own.
If you don't mind making a mess, freeze the rubber & then break out the belt sander, once's it's pre-carved close to shape.
Or, just pick up a Spartite kit. It lets you pour your own custom (rubber) mast collar. And I know a few guys who've used pour-foam kits in lieu of rubber.