Hey. If you cannot do it now then even my powers cannot help you.
That's the best way i've found to do it and i've tried loads. using the rear swing arm as leverage, going at it with a chisel, punch, screw driver. penetrating solution, heat I haven't tried but I still think that's the best way.
I steel all the frames of course! actually I steel the whole bike then sell the only part on it that can be traced via it's numbers. My frames are also too expensive and too cheap simultaneously!
I steel the frames then I service them. I would put them back once fully serviced but I need to earn a living. I'm amazed no ones caught me by now but then again their all thick. I simply steel dirty frames that don't work and then disguise them as clean ones that do work, perfectly!
Then a few shots with my 10+ mega pixel camera that takes such awful blurry photo's and bobs your uncle.
A criminal mastermind is born!!!