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Love the walnut and oak combination. Very aesthetically pleasing.
What a great idea, and they look pretty cool too.Is there any particular reason you didn't go with the grain, though?
Love the simple application of an elegant scientific concept. Keep it up.
To be honest, most tuners aren't perfect and one of the strings is usually out of tune. Tuners seem to get E wrong. I just tune by ear and it works great.I suppose more expensive tuners would do well, but ears are free.
What if you were to cut out a square within one of the sides that was a square and make that hinged? All the edges would maintain contact, and therefore, you wouldn't have to sacrifice strength for practicality. It's quite a nice creation regardless of access to the inside. Keep it up.