Last weekend I drilled a hole in the bottom of the new-old boat for a 3/4" water inlet. When it came to a backing plate/block, I was unsure how to proceed. A couple of guys in the boatyard built their own boats so I asked them. One had a piece of 1/4" G10. I had a wood block in my hand and was asking him what he thought. Then he handed me the G10 and recommended I drill out a few backing discs.

I had an assortment of hole saws with me, the largest was 4". It fit the flange feet with little to spare. Here's how it went:

  • Made three 4" dia. plates
  • Drilled out (2) 1" holes for the thru hull
  • Drilled two plates for the flange and countersunk one
  • Epoxied them to the hull


And that's how I left it. We are going back Sunday to install the seacock and the triducer. I'm curious to see how well the epoxy held up. I'll take pics of the installation Sunday.