On My W123 on the Rear I had one of the Bolts that holds the Shock on break off.

I attempted to use an Easy Out type Tool on it but that did not work and I ended up drilling out the hole and tapping it for a larger diameter US thread size Bolt.

I also had to enlarge the Hole in the Shock that the Bolt goes through.

I assembled the Bolts with an Antisieze Compound so they woulr not rust again.

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84 300D, 82 Volvo 244Gl Diesel