Decided to give this a try. It took less than 1 hr & only cost a few bucks. My drivers seat springs were broken on the left side. Couldn't find any good parts at the u pull yard Friday, so this morning I pulled the seat to see if it would work. The springs like to break at the radius, so I cut them back to where I had straight material to work with on both sides. Then just bent a piece of 1/4" brake line, reamed it out to 3/16 ID with a drill, & slipped it over the broken pieces. No need to tack them in place, they can't go anywhere once installed. I've included a couple pics. The first one shows the broken spring. This one had the complete radius missing, so I just trimmed it up so the brake line would slip over it. You can see the one next to it has already been repaired, but the radius was much tighter, so I had to make a much sharper bend in the brake line. Be careful when cutting the spring with a cut off wheel. Make sure you don't drop any hot metal into the seat where it could catch fire. No, I didn't find out the hard way, but was aware it could happen.

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82 300SD 202K
82 300SD 233K
83 300TD 340K
82 300TD 98k euro (parts on the hoof)
85 300TD 282K
83 300TD 197K