
Seems like a good pen but not what I wanted. I wanted a spring around 15 TPI for use on a swaging machine, but the one I got (1 x 8 x 306) is only around 8 TPI. Well, back to the search!

Electric Guitar Strings Ernie Ball 2221 Regular Slinky - (10-46)
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FKG 99502HNR Bearing Width Pre Lubricated
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