I think the one Shoup and Sloans sells will disappoint you. Did me anyway.  They sell the Speeco spinner.



After holding on to it all day I found it irritating. The best spinner I've used is the Duncan by Irrigation Pump spinners.



However at the end of the day the palm of your hand is dark from the aluminum.

I can find several vinyl coated ones, but like you have had no luck finding a coated base.  You might try an eBay search of tractor spinner knobs.