If the endpin tip is not threaded, the little rubber caps will either a) come off in transport or b) wear out and allow the tip to poke through. Either way, sooner or later somebody's floor is going to suffer damage.
I was never able to find a crutch tip or something similar at a hardware store that would work worth beans. This ball gizmo from Invalid Link Removed is a perfect solution.
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We bought this one, but my daughter can't get it to work.