rebuilding a rudder and boom question

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For a Finn? Go to pretty much any Finn regatta any you can likely pick up a decent used rudder and boom for a couple of hundred bucks. Most of the class has switched to all carbon spars, so there are tons of cheap aluminium ones out there. And rudders are almost disposable on the boats, so there are a lot of non-race ready out there people would be happy to unload.