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A properly installed garboard drain is often useful. I recommend brass or marelon. I believe marelon is used on current production Whalers. Consider generous or possibly copious amounts of cauking to ensure positive sealing and protection of the foam and/or plywood from any possible water intrusion. FWIW, every modern Whaler I've seen has a garboard drain.

IMO, the brass tube and rubber stopper is not the best way to go.