Piano key up/down weight tester.
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Previously:
https://www.homemadetools.net/forum/...218#post141794
https://www.homemadetools.net/forum/...4445#post79975
https://www.homemadetools.net/forum/...153#post134522
https://www.homemadetools.net/forum/...530#post135978
https://www.homemadetools.net/forum/...862#post156379
