Okay, thanks for the tips. I tried forcing the lock open, but the screwdriver broke off in the tumbler, so I was forced to drill it out. Not too bad (I only broke one bit in the process) - it just took some patience. You need to drill at the top of the lock so the you get the magic pin that keeps the lock in place - once you get past this pin with the drill, everything slides out nicely. The new lock installed nicely, and it works with the key, but for the life of me, I can't figure out how the steering lock actually works?