bearings

Hi all, I was wondering what brands of halyard sheaves with ball bearings would be good use for the mast crane. I was gandering a some harken sheaves at my local Westmarine, but I couldn't find any meant for 3/8 line halyards. And I was also wondering if replacing my non-ball bearing sheaves...

The furler setup is kind of funky. A prior owner apparently wanted to do it on the cheap and came up with a workable but non-optimal hank-on jib furler. It has worked great for furling the jib, but doesn't really work for reefing the headsail, no matter. The problem is that the bearings...

Anybody know a source for rudder bearings for a 38?? I'm sure i can get it fabricated from UHMW or the like but thought there may be an off the shelf part somewhere. Replacing in the spring and wanted to get a jump on the parts. Thx in advance, Ben