W126..

My grinder was a chicago tools long neck die grinder, 25,000 rpm 4 amp motor... with cut-off bit in the chuck to hold the cut off wheel. I used a wheel..Checking, 3 inch cut off wheel, 40 grit. I bought a stack of wheels but needed only one, the steel cut easily. A smaller wheel would have been easier to get into the space.

I did leave one tiny nick on the wood veneer above the lock. Also cracked the finish in one spot trying to pry it off so I just left in place. One might shield the surrounding interior parts with something substantial..

It was easy to cut from below but on the top side of my 94 the veneer was too close to get a clear cut and I needed to use the grinder sideways, if that makes sense..just eating away the steel edge on..sparks flying but they did not damage the plastic or wood. Use eye protection!

I basically just chewed the black steel cover back until it left a straight line for the lock face to drop out and then began drilling out the center.

Im still trying to use the pin through the slot on the lock barrel to get the retaining clips to release..Maybe with drilling and more access they will release and I can install my new lock cylinder and replace the metal security cover..Or maybe just go with an aftermarket keyless push button. Meanwhile driving with screwdriver..

Yeah, you need a comfortable place to do an involved job with power and rest, cleanup tools and if needed, media nearby to review for questions. Good luck!