Join Date: Jun 2004
Location: West Michigan
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agree, most share a common pivot, one lever having a tube and the other a solid shaft, the shaft passing through the tube, the tube through a bushing into the seat/bulkhead.
Often you can just disconnect the cables then apply WD-40 to the pivots while working the levers in opposite directions which will clean out any crud or hardened lube inside, when you get them working smoothly, let the WD dry, then do the same thing with a light oil. WD is NOT really a good lube, but works great to break down oil and grease, so make sure you don't skip the oil.
On some controls that were peaned over so they can't be torn down, I've bored a small hole in the tube so I could force some chain lube in between. (great stuff, don't know why more people keep it around!) then clean it off and tape over the hole. Most can be dissassembled and lubed up easily.