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Unread 03-02-2003, 10:49 PM   #2
jaydee
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Join Date: Dec 2001
Location: Spokane WA
Posts: 6,506
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http://chicksdigbattlebots.botic.com/tapsizes.htm

I use a 1/4" NPT tap and a 7/16 drill bit for those barbs. I am pretty sure the chart linked will back that up.
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