I compost everything and don't have this problem anymore, but if your disposal gets stuck, take a stick (like a broomstick) and cram it in the disposal (power off, please). Twist it around and often that will break free the strikers in the interior of the disposal where the food particles or bone has wedged them against the side of the unit. Much easier than crawling around under the sink trying to get the hex key in the little hole on the bottom of the unit and turning it.

I never understand why they don't make garbage disposals that actually dispose of garbage. Why don't they just put a Blendtec under the sink, and route the resultant mush out? That's what I really want. I want to stuff chicken bones, and every single food-related item I can think of, down my disposal. I don't need this wimpy stuff. We don't have a disposal, and I wouldn't bother either. I'd just compost. (Although I don't bother with compost either, because I can't garden thanks to our 50-ft trees shading everything.)

I got tired of our disposal and took it out.  I can honestly say that we don't miss it a single bit either.  All of the vegetable peelings go into the compost bin and we have a lot more room under the sink to store things.