Product review (5 stars): This was exactly what my girlfriend's dryer needed.
This was exactly what my girlfriend's dryer needed.

I had to look up repair instructions on YouTube, but I found a good video and followed the instructions as closely as possible.  To my credit, I almost didn't screw up a crucial part and have to re-disassemble the dryer and try again.  The little loose ball bearing goes on the *back* side of the plastic thingy, don't mess that up or you'll get a noisy dryer and an angry girlfriend, regardless of how much blood, sweat and tears you're putting in to help her.

When I turned the dryer on, it smelled like burning, which was scary at first until I realized that this is normal after doing repairs on a dryer, especially after you've vacuumed the entire thing and blown dust around everywhere.  Don't panic.  It'll pass.