I here ya! I had all kinds of trouble just trying to set mine up, the darn thing just kept trying to derail my chain. No matter how i tried to bend it, or set it up! My bike is a Trek 3700, and was lucky that the chain did not rub on anything after I got rid of it, and it ran really smooth without it! At least that part of my build went well, at least until my motor locked up after only 5 MILES!!
That's ok though, got a new engine coming and gonna tear in to old one to see if it's worth to, or able to be repaired..