At my church, one of the HVAC air flow dampers siezed up. The berrings dried up, and the actuator couldn't do its thing. Our resident HVAC guy (not me, the other guy) freed it up with Channel Locks. Gave me permission to lube the damper berrings.
Where the shaft goes through the bushing is generally accessable. What's a good lube, that will attract minimum of dust, provide lubrication, and stay there for a while?
I'm thinking that WD-40 and three in one oil aren't going to do the job. At the moment, I'm thinking that zoom spout turbine oil might. Silicone spray might. LPS #2, dries and leaves a dry lube might work. Or, two cycle gas mix oil.
At present, silicone tops my list. What else might work?