A quick learner from 06424 says:
September 13, 2016
it's the part that goes in to the guide clip
Paul from SWISCO responded:
September 16, 2016
I'm afraid we do not have an exact match for this pivot bar. I think it may be discontinued and no longer made. That said, perhaps you could adapt our 26-437 to work. Look it over and see what you think. I can't guarantee that it will work, but it may be our best match.