So both seats stopped sliding forward and backwards years ago, in this video I show how I get the gear assembly out, also I try to fit reproduction 3D printed gears with little success these gears are not available from Mercedes, they might sell the entire thing but very costly, best bet is to get used ones from eBay and that's what I'm going to do (part2), from my research early R129's had problems with the white nylon gear breaking, years 1989 to 1992, in 1993 Mercedes started using black plastics gears, probably because they are stronger, after reading many posts for this problem its mostly owners of early R129's complaining about this issue.

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