I am about to install my fourth lock cylinder in the ignition. It seems these after market cylinders don't last very long for me--only one driving season. Am I the only one with this problem? I complained to my supplier when I bought my third cylinder and her gave me a fourth one to replace the third one when it wears out. The third one has worn out, i.e.I turn the key to shut off the engine and nothing happens--the engine continues to run. I had to shut it off by shifting into first gear, standing on the brake, and releasing the clutch to stall the engine. Any suggestions for a new supplier who can offer a robust cylinder?