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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 hide exif
Full EXIF Info
Date/Time07-Apr-2009 15:33:47
ModelNIKON D200
Flash UsedNo
Focal Length34 mm
Exposure Time1/60 sec
ISO Equivalent200
Exposure Bias
White Balance
Metering Modematrix (5)
JPEG Quality
Exposure Programprogram (2)
Focus Distance

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