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Date registered: Jul 2009
Vehicle: '92 300TE 4matic 250,000miles
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Take it from somebody that delves into vintage electronics....don't risk spraying contact cleaner on those rheostat parts, If you are unlucky and let's face it, your car hates you, you could dislove the plastic parts. A safer alternative is DeoxIT D5, work it, let it dry and follow up with DeoxIT Gold GN5, work it and then let dry.....good to go. They come in a small kit @Radio Shack...not cheap.
Any gears you slip back on should at least have a drop of super glue on the cleaned shaft-cheap insurance. But like augapfel said, if the gear is split, you need to find a fresher one.