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Re: Suction....
Ours uses a large ( 24" diameter ) saucer shaped, suction cup which is mounted on a bracket, which in turn rides along a cam track, so that the suction cup rotates from 90 degrees ( at 20" above the floor ) to a vertical
position. We then have three rectangular aluminum tubular arms on each side which function like a forklift to elevate the trackball. We'll put in over the overpass and realise it, back up slightly, and go after the trackball again. It's amazing how much suction,the smaller motor generates, and how hard it is to knock it loose, if you can.
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