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Originally Posted by JustJeff
Not so much a groove, it's shiny from wear...if you run your finger over it you can barely feel it. I do not know the history on it other than it came out of a 90. It's an eBay purchase, so I may not get a response to questions.
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Hmmm...my vision was pretty bad last night due to a horrible few days at work, so you have to excuse me a bit.
I just saw that black line and went *WHAT?*.
So the black line is caused by paint?
There should be no other reason why such a black line be on that part of the counterweight due to normal use.
I'm also a little bit worried about you stating: "if you run your finger over it you can barely feel it."
It's in constant contact with a silicone oil seal that's rotating.
It it were a perfect world, that area should be smooth.
A slight imperfection could easily destroy the oil seal in short order.
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Since concerns have been raised, it was also painted, which I planned on lightly sanding off, but it has a small notch in it also. Is that small ding enough to cause balance issues?
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That ding doesn't look that bad.
There are vendors that offer (re)balancing services if you're that worried.
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I assume that taking it to a machine shop would then affect clearance between seal and counterweight?
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You can talk to the machine shop and ask them for their advice.
Explain the situation, and they should be able to give you an answer?
A competent machine should know proper clearances for this application with this type of seal...
-Ted