The cork seal was intact in this gear case but was no longer tight around the prop shaft. I just made, and added, a leather seal on top of the cork one. Here is a link with some tips on how I make gaskets. https://youtu.be/I0FrFA__n00?si=ON_CXt34_b2EvVql
This is a link to a guy on eBay that sells gaskets for antique outboards
This is a link to a guy on eBay that sells gaskets for antique outboards https://www.ebay.com/sch/i.html?_nkw=Johnson+1940+AT10+outboard+gasket&_sacat=0&_from=R40&_trksid=p2505460.m570.l1313
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A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.