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Old 04-26-2012, 01:21 AM   #4
H. John Kohl
Montana Master
 
Join Date: May 2003
Location: New Bern
Posts: 4,294
M.O.C. #311
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I measured mine and found the thread length was 20.5". So 19 to 20 should be safe. If you hear any resistance then stop immediately.
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