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Compass Marine How To | all galleries >> Welcome To >> Seacock Backing Plates / Alternate Method / No Through Bolts > Clamp & Drill
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Clamp & Drill

Clamp & Drill

This is the most critical step and why you really should have a drill press. Because you are literally drilling and tapping a piece of 5/8" fiberglass or epoxy sheet, the threaded holes MUST be perfectly centered in the flange holes, and they must be 100% vertical.

I made my spacer square, and wider than the head of the thru-hull, so I was able to clamp it in my drill press vice. I can not stress enough how important it is to make perfectly vertical holes that are perfectly centered in the holes of the flange or seacock. There is NO wiggle room here. Mess this up and you just wrecked the backing block..

Nikon D200
1/60s f/5.0 at 30.0mm iso200 hide exif
Full EXIF Info
Date/Time09-Apr-2009 13:43:11
ModelNIKON D200
Flash UsedNo
Focal Length30 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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