Hi Bill,
I never got an answer of this "mysterious" Barry Robinson. Business must
be too good?
Anyhow, I have only seen square rings. The most practical solution I
heard of is to buy Square Buna-N cord stock by the foot at MSC
(Manhattan Supply Co) at mscdirect.com or 800-645-7270. Available in
square, round or metric ! .098 sq is $0.34/foot, 2mm dia is $0.14/foot,
3/32 dia is $0.10/ft . With superglue it is easy to make whatever you
need. These are some sample prices out of their 2004/2005 catalog.
Hope this helps.
Robert
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