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If you are using rebuilt 15GP22 guns, which can't be cheap to rebuild, Don't waste them on tubes that are known leakers. Concentrate on rebuilding tubes that are under vacuum for now, maximize your success rate, improve the process, and worry about the duds that have gone to air later. I'm not sure a tube that has a leaky flange seal can ever be repaired and rebuilt satisfactorily.
Just my thoughts.
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