Ebb When I was drilling drain holes on #50 , 2 holes on the side of the keel , both approx. 7in up from the base , showed a thickness of 3/8 - 7/16. I installed a new through hull for a raw water pick up for the sink just before the "turn to the bilge" and it showed 5/8. I suspected the 1 1/8 to 1 1/4 I found at the forward base of the keel was due to overlap of roving . ??? Any thoughts?