I used 0.5mm CS X 1.0mm ID 70 durometer from theoringstore.com on an attenuator from my HP 8560A
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They are 0.22ea. with a $5.00 minumum order and shipping runs $9.95 so you will have to order 22 to meet their order requirement.
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I'd order extra and store them in an airtight bag. They are really tiny!
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Sam
W3OHM
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Sam Reaves