I just meant that it won't pull smoothly no matter how hard you try. The crazy-strong friction causes the skipping effect, I think, and the magnet rubs across the glass in a series of tiny jumps, and makes that r-r-r-r-r sound.
I mean, strong is good, but too strong may be not so good like you say... I almost bought the middle size Mag float the other day (just barely strong enough) but they were sold out, of course.
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Alan
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