Changing a quartz crystal's frequency with sandpaper and a pencil

Did you know that you can open up a quartz crystal to change its frequency by a few kilohertz? Here's how.

Link to Robert Sumption's video https://www.youtube.com/watch?v=j7CS4A8wB1E

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Видео Changing a quartz crystal's frequency with sandpaper and a pencil канала Amateur Radio VK3YE