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Re: popdown casters
Why do you need multiple castors? Just use one, and have a small cylinder pop it up and down. The cylinder could have less that an inch of travel, and therefore would be small, compact and lightweight. We were going to do this if our omni's fell though.
I am sure you can three wheel it for the turns. Plus, it should be down for long if you program it to pop down only when you turn past a certian angle.
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