My manual garage door has several wheels on each side of the door to keep it on track opening and closing. The top wheel on each side of the door has a separate track just above the other track. One of the top wheels came off and I can't figure out how to get it back on the track, as the wheel is a little bit wider than the track. There is no wide place on the track to reinsert the wheel.

I can take the wheel off the door and put it into the track, but if I do that, getting it back on the door would be even harder than getting it back on the track, I think, due to the 4 or 5" piece of metal that hooks the wheel back into the door. (Don't worry if you can't figure out what I'm saying here. I'm feeling pretty inarticulate.)

It's a Windsor Door model 535. When I looked it up on the web, I found no instructions for this or any other Windsor model.

Any suggestions? Thanks!