Can an already programmed transponder key be reprogrammed? My ignition key cylinder's locking function is broken; key can be removed even while car is running. I've read other solutions such as strapping the old key to the SKIMM and replacing the cylinder and key with nonSKIMM, but then you have a seperate key from the doors and trunk. I haven't found anything about being able to mess with the tumblers like you can with home locks. My thought was, while at a junkyard, to pull the keys and all the lock cylinders (doors, trunk, ignition) and reprogram to my SKIMM.