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Wow - P.A. Clausing, in Chicago?? I ground and polished my own mirrors for two Newtonian reflectors (telescopes) I built, and sent both mirrors to Clausing for aluminizing (actually, they call it "Beryl" coating, I think), and their work was absolutely flawless. That was about 12 years ago, though - sometimes with these family businesses, the kids take over and everything goes to hell...
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