I had just got off the freeway when the engine started squealing.

The spring on the tensioner pulley sheared off about 3 coils down from the top.
I was able to limp it over to a buddies house, and get a ride home to pickup my spare.

I had a spare because the one that broke was brand new, recently bought from pelicanparts. The pulley was making noise so I figured why not replace everything. It only had a couple hundred miles on it.