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Compass Marine How To | all galleries >> Welcome To >> Seacock Backing Plates / Alternate Method / No Through Bolts > A Perfectly Centered Hole
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A Perfectly Centered Hole

A Perfectly Centered Hole

By using the pilot hole you made the original circle with you will automatically have a perfectly centered hole in the backing plate.

Be sure to use a hole saw as close to the OD size of the thru-hull as is humanly possible. There should be very little room between the threads and the fiberglass.

Please be aware that working with G-10 or even GPO-3 board is like working with steel. It eats tools for lunch.

Nikon D200
1/60s f/4.8 at 34.0mm iso200 full exif

other sizes: small medium large
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