My sons 1965 Ford Mustang. Putting the new ignition switch in the dash. the how was larger than the new unit. Figured the PO had rigged the dash with some off the wall switch. We had just bought a new under dash wire harness. I did not want to modify this $399.00 harness.
I decided to add material to the opening with the MIG welder. started to add material and after about 10 minutes I realized I had either destroyed the dash and would have to go find one at a junk yard and cut out the old section and weld in the new ignition section, or I was going to make this welding thing work.
I worked on it for the next 2 hours, without telling my son, and finally got it to work fine after lots of welding, grinding, welding, grinding, filing, welding, etc.

Dave

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1970 220D, owned 1980-1990
1980 240D, owned 1990-1992
1982 300TD, owned 1992-1993
1986 300SDL, owned 1993-2004
1999 E300, owned 1999-2003
1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD
1988 560SL, 100,000mi, owned since 1995
1965 Mustang Fastback Mileage Unknown(My sons)
1983 240D, 176,000mi (My daughers) owned since 2004
2007 Honda Accord EX-L I4 auto, the new daily driver
1985 300D 264,000mi Son's new daily driver.(sold)
2008 Hyundai Tiberon. Daughters new car