GE GAS Dryer idler pulley re-attachment problem

I’m guilty. As I was pulling out the drum for rear bearing support I knocked off the idler pulley - And can’t quite figure out how to reattach it. Here’s my description along with questions:

Looking from the rear:

The belt comes from the right side of the drum then around the left side of the larger (white) top pulley

Down to the lower wheel along its right side then loops up to the left side of the drum. I’m pretty sure that’s how the belt was on before I screwed up.

But - I can’t figure out where to attach the spring from the upper arm to where on the motor mount. I’m wondering if a part could have fallen off the larger of the pulley which keeps it on its shaft.

I can take a photo if necessary but sure would appreciate some guidance ASP. I’m the kind of guy who doesn’t sleep very well when I go to bed with this kind of unsolved problem hanging over my head.