I am in the process of acquiring a 1984 190 2.3 with a 5-speed. It has some rust, yet is very solid. I have two items to repair and I am seeking wisdom for these repairs.

The first repair is my biggest concern. The key will not turn in the ignition unit, thus the steering wheel can not be unlock to turn the wheels. The keys work fine on the truck and doors. Since the key must be turned to remove the tumbler I am uncertain how to get this unit removed. Any thoughts?

The second repair is the front springs. One is broke and the other is cracked. Has anyone ever replaced theses or should I take it to a shop for this repair?

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Current:
1985 300D aka Miss Margaret
1991 300SE aka Alarice
1995 SL320 aka Samantha
1997 K1500 Silverado
Past:
1999 E300 ex-wife got it and let her son ruin it
1984 190 2.3 ex-wife got it and let her son destroy a great car
1985 300D (CA version) aka Maybelline lost to deer at high speed.
1981 300D aka Madeline (went to salvage at near 400k) rusty, yet best car I ever drove
Wishlist:
McFarlan TV6 (only a few privately owned)
ReVere with Rochester engine
1917 Premier (only one left)