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Compass Marine How To | all galleries >> Welcome To >> Seacock Backing Plates / Alternate Method / No Through Bolts > Tapping The Backing Plate
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Tapping The Backing Plate

This is fairly straight forward but remember to tap this totally vertical. Avoid over tapping or multiple tries or passes. Each pass will remove more material, once in, once out..

Nikon D200
1/60s f/5.0 at 48.0mm iso280 full exif

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Guest 30-May-2010 00:02
To ensure your tap starts vertical, you can put it in your drill press chuck and turn the chuck slowly by hand. Once there are a few threads cut, you can transfer the tap to a regular hand-held tap wrench.