A spring loaded pawl and ratchet clicking every 5 degrees or so might have worked. Don't think anyone has patented simple machines no matter how much they'd like to.
Wifi channels are not far enough apart so try not to use adjacent channels if you have multiple access points or wireless networks. So rather than 1, 2 and 3 you would use 1, 3 and 5 or 1, 6 and 10 even better.
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