Saw the question but I don't have a pic because I don't have distributor welded like that.
I tacked a small section of 1/8 rod in the ends of the slots to limit mechanical advance travel with mine.
Could probably find pics on the net, but possibly not one of ours.
I can check.
Yea, not finding a pic of one welded.
Just a 1/4 or so spot with a mig at the top of the weight posts to the slot edge will do it.