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Re: R06
As Sean said, we have a pair of metal ball transfers on the corners of our intake device. They are only there to protect the field. Under normal circumstances (e.g. we are on level ground), they don't touch the carpet. They only touch the bridges.
I don't see why they would be a problem. A caster is not really a traction device. We looked a plastic ball casters, but the problem was finding one that we felt confident would hold up when we whack the bridges.
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