Thousands of patches and info in restoration.... I will move the thread.
Quickest patch is a piece of a street sign (aluminum) coat it with 5200 as glue and place it over the hole and run a few pop rivets through it and the hull. It will seal tight and do the job.
Sorry to hear it, I think that if it's just a fisher I would use a pair of rubber washers covered with flat washers and tighten it down, might add some rtv at the bolt.
