I used 3/16 O.D.tubing ; when flattened a bit to fit in the fin groove it still has plenty of internal flow capability (it's actually larger than the stock barb hose fitting) + this goes into a 65+ mph hydro which has tons of pickup pressure from the rudder pickup. I'm not worried by any slight (if any) flow restriction - these setups rarely get hot under race conditions anyway
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I considered drilling out the fin area but, even with my drill press the margin for error was a little too worrisome
you can see the butt of a 3/16" bit if you look closely
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Mike, I was fresh out of copper and/or silver tubing
DSC06225.JPG
I considered drilling out the fin area but, even with my drill press the margin for error was a little too worrisome
you can see the butt of a 3/16" bit if you look closely
DSC06223.JPG
Mike, I was fresh out of copper and/or silver tubing

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