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Did one of these recently for a builder friend who was in trouble. I used a hole saw with a device that allows you to place a hole saw of the correct size in the existing hole and use it to guide a larger hole saw. Cut the larger hole 5mm down to fit the tap base and dropped it in.
Horrible bodge but you could use a version of the method to cut a clean hole and then plug it with a closely matching wood and drill that plug for the tap. Or fill it with something like repair care (or another epoxy resin designed for rotten wood). That could leave you with some decorative issues but it will never rot!
More wooden kitchen counter top fun.
I've had to replace a leaky tap, which, it would appear, has been leaking for some time - The hole drilled through the wood is full of rot, and any new tap will no longer fit flush.
Is there a quick & dirty way to fix it?
If it was a bike, I'd shim the hell out of it.
I need some some sort of gasket / brace to square the tap against, but can't think of what I should look for in a DIY shop.