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Old 03-09-2010
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SanDiegoChip SanDiegoChip is offline
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How to make a 1/2 through hole a 1 1/2 through hole?

Hi,
We have a ˝” through hole and it is above the water line. It is for waste discharge. We want to replace it with a 1 ˝ inch through hole.
How would be the best way to make the new hole?
Remove original through hole.
It leaves a hole in the boat.
Now how to make it the right size for a 1 ˝ through hole?
Use a hole saw, but how to get it started? Need a drill bit in center but nothing to sink the drill bit into.
Maybe put a small piece of plywood over hole and fasten with screws then use hole saw?
Which side to drill from so it does not wreck the gelcoat?
Any better ideas please?
Thanks,
Chip
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