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We too had a suction cup, but we never had a problem with it. Once it was locked down, we couldn't be pushed off the ramp. The only time we were not on the top of the ramp at the end of a match was against wildstang in the archimedes quarterfinal, and that's because we let it go to push them off the ramp.
We had a 10" diameter suction cup that was pushed down using a 2" bore cylinder. This raised our wheels off the ground, so we only had a 10" footprint that needed to stay on the ramp. We then generated a vaccum by using a globe motor on a leadscrew to draw out a cylinder.
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