Well, like I said, I've set up a fer of the dual idler sets and watched the degree wheel. I've not seen the variation you describe. Not arguing, just saying I have not seen it and I haven't. It would be very easy to just center drill the arbor for one of the idler gears and bolt it directly to the front of the block. I would rather mount it on a plate and make it adjustable. That way I could really zero in on the gear lash.