Get a propane torch and heat them up. It's way cleaner than a dremel of a grinder plus you won't worry about grinding thru the tube. A torch is how they got there and a torch is the best way to get them off.
__________________
I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC