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It would appear that the 15GP22 is a total lottery: some will leak, some won't, with no good way of determining the losers from the winners. A 21AXP22 should be markedly more stable than a 15 incher, but still substantially less stable than the all glass types. I guess I'll just leave my spares on the shelf where they are and hope for the best. It's a fairly consistent 62 degrees (+/- 3) with extremely low humidity.
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