so what it was, was the hanger was loose a little
it was because of a repair i had made
tolerances slightly out before when i got a new hanger
i had used aluminum metal tape to add a few thousandths to make it tight
eventually it wore away somehow
so the der had more play than it should have had, side to side
fixed same way again
this time i will know though

plus i straightened it, it was ever so slightly angled, the hanger

wle