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I did it before the how-to article, thanks to recommendations by Louie, George and John B. I gained a definite improvement.
My primary wasn't pinched, as I'd checked this on a previous mirror-cleaning exercise, but my secondary was definitely pinched, causing flaring around bright stars and the moons of Jupiter.. like little comet tails that wouldn't focus to a point.
Definitely a worthwhile exercise in checking (it's not even that difficult) and can improve your views significantly.
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