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http://www.analog.com/en/other-products/ios-subsystems/5b38/products/product.html
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Feb 22, 2014
We purchased #8 and #13 bead chain from McMaster. The ball OD for #8 is 5/32 and #13 is 1/4 inch.
We can use thin-wall stainless steel sleeves to add a rigid section. So we want stainless that is just over 5/32 ID, which is 0.15625".
this vendor sells tubing in 1 foot lengths, $13 per foot. We want size 7X for the #8 bead chain
http://microgroupstore.com/hypodermic-tubing.html