You may go buy a few, find which one fits the best and take demensions from it. Then return them to the HomeDepot or wherever and purchase a stainless one through McMaster.
I bought mine from the local ACE hardware and just bought spares at $0.50 each.
When I looked on McMaster all they had in stainless was narrow diameter spings which I felt were much too small to work with my setup. I'd be interested to see what others are using.
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