Wait a minute- you put that pulley on and didn’t check if it spun freely? Or it spun when you originally installed it but at some point it quit? How seized was it? Where’s the video of it NOT spinning freely?
Yup, took it for granted that I'd be gtg--yeah, I know. It did spin, but not as it should've. Pretty positive it was because of the original concave washer I reused--
On the right. This was it after I fixed it the 1st time. You can barely see it, but it's spinning.
I checked the idler today and the outside wasn't burned or marred, so it was spinning, but just not as freely as it should've.
New one on the left.