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post #1 of Old 03-09-2010 Thread Starter
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How to make a 1/2 through hole a 1 1/2 through hole?

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?
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