Originally Posted by
Herbie53
Call the shop. The bike is still there getting fixed.
Maybe I should call yours and see if you are really the mechanic you say you are.
Believe whatever you want.
There's very little stress on those pulleys, so they are usually made of plastic. It's fairly common for them to break when the chain gets wrapped, but not very common for the chain to wrap up because of the broken pulley.
You could be right, but in my experience it doesn't happen that way.