Regarding obscure O-rings, I'd suggest finding a well-stocked Ace Hardware
or True Value Hardware store, or a Sears Paint & Hardware outlet store (i.e.
not a full-blown Sears, just a little Paint & Hardware outlet that often is
found in suburban strip malls). Any of the above usually have a huge variety
of fasteners and odd bits in manufacturer-supplied plastic bins. I could spend
hours there. :-) I don't remember such big assortments in past years; I think
it's the increase in Do-It-Yourselfness and the lure of big home-remodeling
centers that's spurred hardware stores into actually stocking hardware again.
-- Andy
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