Is it possible to re-hub my 1975 15 hp thru hub prop? I have a machine shop, so I could do the work, but where can I get the new insert? Is there any secret to getting this in? I hate to get new if I don't really need it. It's the "standard" one for the 15: (0386118 PROPELLER,9-1/2x10) Are there other tricks for increasing friction, like adding a washer or something ? Thanks.