How to replace ignition cylinder?
 

This past weekend I broke my key off in the ignition. For a while, the car actually started when I put the outer half of the key in and turned, but after about 5 starts I wasn't able to do this anymore. I think the broken part might have shifted further into the cylinder, and so it no longer shares a tumbler with the outer half of the key. Basically, I think that the turning the outer half can no longer drive the inner half, so the lock doesn't turn.

Anyways, I've tried everything I can think of to get the broken key out, including picks, stiff wire, coping saw blades, files, etc. I also had a locksmith trying for 4-5 hours to get it out as well, but with no success. So I think changing the lock is the best option I've got left.

I haven't found a very good thread or write up on changing the lock, so I thought I'd start this thread. I won't be able to work on this for some two weeks (this happened right before my cross-country flight to see my family), but I'll post the materials I'm buying and so on. If folks could leave their wisdom here too that'd be much appreciated.

Looking forwards to finding a resolution for this! First off, this thread recommends taking off the steering column, and recommends removing the steering wheel. (I have a stock steering wheel). Is all this disassembly really necessary? Also, what's the best way to buy all 4 locks? Are these $80 ebay parts legit?

you would need to remove steering wheel, clockspring, and combination switch and disconnect all plugs leading to the combination switch. Pull the combo switch off and take the 2 bolts off holding the steering column to the crash bar. When the steering column swings down enough you will see 2 bolts on a rusty clamp. The bolts need to be notched for a screwdriver so that you can undo the bolts holding the clamp. If you are not successful doing it in the car, disconnect the U joint at the firewall between brake and accelerator under a plastic cover (one pinch bolt) and 2 nuts holding the column to the firewall. Then you can pull it out of the car and do this work on the bench or vice.

Ok, sounds like a job that would take more than a few hours.

I guess what I really need in the short term is a way to turn the cylinder (it's currently parked in front of my buddy's house). I saw this video on turning the lock cylinder without a key, but he's doing it on an older Camry:


Does anyone know if this would work for a 97 Miata?

edit: I just realized that in the video he only turns the lock to the accessory position. I don't know if this fixes my steering wheel lock problem. Is there a way to quickly destroy the lock as well?

I can't watch videos at work so I can't say...

Could you pull it out with a powerful magnet? I have some at home that are rediculously strong for their size....

(Neodymium magnets from eBay)

Thought about this too. Problem is that the portion of the key is deep in the cylinder. So it's behind some tumblers. Also I think the key is mostly brass, so it's not super magnetic. I think the magnet would probably stick a lot more to the tumbler. But if all else fails, I'll try it.