If it's not broken it should return the butterfly easily. If it's not broken but won't return the butterfly it may just need to be loosened up some. It may just be some crud built up & working it manually some may free it up. A good healthy dose of carb cleaner can't hurt either.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.