I wish you luck. Like I said in my earlier post, the problem I had was not with the tumbler assembly itself. It appears to be with the locking pin assy that goes from the steering wheel to the switch itself. I pulled everything apart and lubed it. It's a bit better, but still sticks every now and then. I discovered if I gently pull the steering wheel to the left while I turn the key it seems to go pretty smoothly. I look on it as a low tech anti-theft device.