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- Both are correctThe answer is that both are correct, but their usage depends on where you are in the world. “Castor” is the British spelling, while “caster” is the American spelling.thecontentauthority.com/blog/castor-vs-caster
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Castor vs Caster: Usage Guidelines and Popular Confusions
What is the Difference Between Casters and Wheels?
Castor vs Caster - What's the difference? | WikiDiff
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Castor vs. Caster — What’s the Difference?
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Understanding Casters: A Detailed Guide to Selecting the Right One