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Make sure that the rotary switch is a "break before make" configuration. Switches used in audio work are often "make before break" to avoid popping noise when the switch is moved from one position to the next.If a "make before break" switch is used it will short the supply Voltages to each other when the switch is rotated. Sparks or damage may be the result.
I would think of this more as a nut runner rather than as a wrench. I wouldn't try to actually tighten anything with this. PVC has an unfortunate habit of shattering violently when over-stressed. An outer jacket of heat shrink would make it a lot safer to use. Heat shrink with an inner melt-able sealant layer would likely increase it's strength as well.
Nice job, I like your approach. Looks like something I would be likely to do.I see that you have a fan on the back. Hopefully it is trying to blow air out the back and not in. If it is blowing in, it will eventually fill the box with dust.If there is a fan there should be vents somewhere else so that the air has a path both in and out of the box.
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