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To try something new, the window was lowered to 1/4, 1/2, 3/4, all the way down, then raised to 1/2, 1/4, 3/4 and all the way up, and silicone spray was applied liberally in each of those positions.
My reasoning is that this increases the odds of lubricant moving to the sticky part(s) in various extended/folded positions of the regulator.
So far this seems to work OK(no squeaks so far).
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