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Hi Art,
There is sure a lot of information in the Wikipedia link on meter builds. Thanks!
I read the posts about the needle sticking and agree that approximately thirty years of dust and grime can “sift in” at any time.
I read on a thread where I guy pulled his cluster to find all kinds of white powder all over the dash components. His first thought was it might be a busted bundle of dope!
But after studying it for a moment he decided the previous owner must have worked near some mining operation.
I’m going to suggest that if he pulls the back of the cluster off to “not touch the needle by hand” but to use just a “breathe” of air to push it.
I know it hard to puff that much in the right place.
I’ll suggest to use a hair dryer, blowing cold, on a low speed setting would work best.
If brought over towards the needle from a distance and then moving closer as the needle move up and around to the 38 mph, it may show the same effects, as if it was in operation.
Using the tactile touch of a finger push just might “bust” right on through the tight spot and not feel a thing!
The deposit of a particle could just move elsewhere without ever knowing if it was still there!
This test method can be used further, a few times, to test more of the swinging range if that happens.
Like the galvanometers it is a delicate instrument but not that much so because it’s in a car and not a laboratory.
Just be gentle with some diligence in diagnosing, will probably fix it.
TLC always goes a long ways as it’s a simple mechanism as it’s only one axis of movement involved.
Maybe just a drop of denatured alcohol on each pivot point will remove a crusty spot.
It would work as a rinsing agent.
Lubricants are probably not used in the factory as they attract things later.
A tiny blast of “dry silicone” and with it’s thin carrier agent, it might be the best solution too!
As far as the coil gap I’m thinking if something is in there, a gentle enough rinse might be good.
I agree that a blast of air can ruin hair wound springs and dislodge who know what!
I hope our discussion gets him fixed up with the right thinking tools for this small challenge.
Phil
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