Originally Posted by
manicmike
I just deleted a message I'd written contradicting that the flat side should be on the left.
Who knew that the 15-91 is different from all other model 15s??
I think the 15-91 is the only one but it's certainly not obvious. I had to DL the 15-91 manual to check.
I believe that 15s from the 15-88 on are flat side left. Earlier 15s and 15 clones, which are based on the earlier 15s, generally are flat side right, threaded left to right.