Although this thread has been...
Although this thread has been dormant for a long time, if anyone else is looking for good replacement casters for a danish tea cart, this company makes a high quality version. I have seen an example of this in a Pontoppidan teak tea cart. While it did not match the original white rubber wheels, I thought the newer black wheels matched the black laminate top better.
http://www.vintagehardware.com/index.php?cmd=product&prodid=26002
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