I just took another look and the stop tabs on the fork member are both OK, but
I did find the problem. The small metal plate that is welded to the front of the frame
has a small indentation on the right side. This allows the forks to swing a little farther
left than normal. I think this has been caused over time by the bike sitting on the side stand
with the forks all the way left. Anyway the only fix I can figure out is to put a small spot weld
on the indentation.