Hording is a simptom of the fear of mortality. You can't just dump the stuf and expect the old guy to forgive you. You 'll need to come up with some reason to clear out the boat that HE also thinks is a good idea and over rides the need to have more than one extra. Ask him for advise on how to make the boat handle better and/or sail faster. Start aranging a short cruise
and ask him to help you to arange the supplies and necessary equeptment onboard. Be sure to ask,tap into HIS expertise,get him to say there's to much junk on this boat and it's got to go.