OK, here is james bond trick for stub removal. may take several tries. not guaranteed to work, but may. take a beer can, or soda can. with scissors, cut some strips like key size. put a bend on the end of the strip, bending it back 180. making it like a hook. carefully insert into lock, sliding it up beside broken key. this would take some in-n-out to get it slid in beside the broken key. working the aluminum, in and out, til the hook hooks over the end of the key piece and it may pull out.