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Discussion Starter #1
I'm installing a new 3/4" ID thru hull (forespar marelon). The actual hole sizing required is at least 1 1/16". Should I oversize the hole (i.e. 1 1/8 or 1 1/4) so that there's plenty of room for sealant or size it as accurately as possible. Any Thoughts?

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Drill the hole as close to the correct size as possible to give the fitting the greatest mechanical strength.
 
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