And what problem is that? Stored in a swamp?
These assemblies are built rather well, but the spring can wear, and possibly break or get jammed. Effect= no timing advance (that's why it's there) when it's not working properly, the effect is like on an old gasser. The curb weights on the distributor jam and there is no spark advance. A contributing problem?

snapped_bolt

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'81 240D For now, a good place to borrow new parts
'80 300TD Probably will be put back into service!
'79 240D BACK IN SERVICE SINCE 09/16; limited use, oil leak. Guide pin r/sealed/replaced. Still a leak. Front crank seal....