T Topogigo Free Member Oct 15, 2008 155 35 28 Kamloops BC Canada Jun 24, 2016 #1 What helix does the 15 163 use? Thanks
richracer1 Well-known member Lifetime Membership Feb 2, 2011 3,626 2,480 113 Idaho Falls, ID Jun 24, 2016 #2 56/42/36