I have thought about using the neodym magnets, but the only problem is the float switches themselves are magnetically triggered. Now if the holder magnets are too strong, it will hold the switch down in a closed/open circuit and it'll top off 24/7 non stop or not top off at all... so we really have to find the right strength magnet to pair up with the float switches for that method to work.
Now if the magnets can only be so strong then glass thickness becomes something to address unless we only want it to work on 1/4" thick glass..but one possible solution to that is build the holder so it extends further out away from the magnet.
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Eugene
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