Product review (5 stars): Exactly what I needed
It was just two days ago when our Whirlpool Duet Sport made a horrible noise of a belt slapping the side of the washer and then it broke and tangled up around the motor. We started shopping for a new washer, but I thought I'd give replacing myself a try. Less than $20 at risk. With the help of a YouTube video (thanks, Appliance Parts Pro .. who are great to deal with too, although this time I used this Amazon seller), we're now washing clothes again. Unscrewing the back was tedious, but with a 1/4" nutdriver handle, it isn't bad. It only took a few tries to get it around the pulley and then I noticed it was no longer centered of the motor shaft ridges, so I had to pull it off and do it again. But not horribly difficult. Helpful hint: Place the belt centered on the motor shaft ridges first and hold the belt taut so it doesn't move. Then feed the belt around the right side. Before trying to get it all the way around (unless you just feel lucky), use a couple cable ties or bread twist wire to hold the belt tight against the pulley on the right side where it is already in place. That gives you two hands to rotate the wheel to complete the job.
Needless to say, but triple-check that you have the right part for your model number before doing this, as I can imagine this would be frustrating if the ridges didn't match or the belt was just a 1/2" too short.