I used toggle switchs with a knotched keyway and matching washer with a protruding tab on it. When you drill the hole in your panel for the switch, you can add a backing plate that along with a matching hole for the switch, incldues a 2nd small hole that captures the tab on the washer. This locks the toggle switch and washer in place, preventing rotation. The switches and washers are available from B&C electrical. As an alternative to the backing plate, you can drill the small hole for the washer tab in your panel. If you do it from the back, and be careful not drill all the way through, it will be invisible from the front.
erich
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