Just got the new nuts from ebay.... and they're 18tpi not 16tpi aaargh!
Looking at the ball joint it seems to me that what's caused the problem is that the threaded insert in the wishbone is slightly undersize (must just be a tolerance problem I think since I can't think of any other thread that would be so close?) and has damaged the ball joint threads a little - just enough to disengage and thus strip the jamming nut threads anyway. Looks like I am going to need a new ball joint - and ideally an 11/16 16tpi UNS tap to open up the wishbone threads... anyone got one of those on the shelf?! I'm meant to be driving up to Scotland on Friday with a friend. I'll see if I can get a part number off Marlin tomorrow - John, have you had any luck finding your spare joints?
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