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Verify the extent of the rot is around the thru hulls. Do not assume anything.

Dig out the mush on both drains and fill the holes with Git Rot.

See -
https://www.boatlife.com/boatlife-blo...t-git-rot/

Re-drill the holes for the drains and reinstall with fresh drain tubes from the

I have a Whaler owner and friend outside Dordrecht who may be a good source of tech support. Can put you in touch.