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Originally Posted by KenWittlief
I think the simplicity and low energy requirements of a 2 wheel drive system are being overlooked:
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Agreed!
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Anyone who has ever pushed a shopping cart knows castors take some force to get them to point in the direction you want them to go.
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Ball casters solve this problem nicely (
McMaster-Carr #2364T1).
If you go with these parts, be sure to reinforce the mount - the stud mount sees a bunch of stress and breaks easily if you run into something.