Originally Posted by
noobinsf
I see -- so the old threading really could be anything, and the thing that folks typically do is simply to update the old threading to the current accepted standard. Yes?
...if your hole looks like it's never been threaded, try an M-5 tap in there and you should be good to go. If the M-5 is too small to cut decent threads, you might need to go larger (M-6). If it's obviously threaded, try an M-5 tap and see how it fits in there.
That's pretty much worked for everything I've racked or fendered. There are probably some exceptions that some one knows about, like Whitworth British bikes or something. That's what always happens here when I make a general statement.
