Waterproof covers are not screwed onto the switches - it seems that the thread is not the same, at first they are screwed on by about a turn and a half, then they stop. I've tried every cover for every switch and they are all the same, it's up to the supplier to troubleshoot, test and fix. I've used capless switches and they seem to work fine for 12V at 1A, but when I'm outside I don't know how long they last with the switch open.
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