I don't think I want to go to this extreme to change a frequency. After I grind off some of the crystal, I would need to test the frequency. Then propablely grind off some more, remount the crystal, and so on .....This is probably a hijack but a curiosity from my past. In the 60's a class mate was a keen ham operator. In those days one could extract the crystal from the holder itself. He mentioned to me he was up-shifting a crystal by "grinding" it on a flat surface with toothpaste as the grinding medium. I loved the practical bent that ham operators seemed to manifest as a matter of course.
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