h a l f b a k e r yThe phrase 'crumpled heap' comes to mind.
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Sticky shopping cart casters are a major problem in modern life. By attaching many tiny little casters all around the outside of the larger wheel, the stickiness or wobbly motion of the larger wheel may be ameloriated. Any stickiness with an individual little caster would not be significant since there
would be so many of them and the others would compensate.
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