I keep a small assortment of general hand tools (sockets, wrenches, pliers, etc). I also have wire on hand, some good water/fuel proof tape, epoxy, and jb weld. I keep a manual hand pumping bilge on hand as well just in case. I also keep extra hydraulic fluid and oil handy as well. I frequently drive the boat over to the Bahamas, so having all kinds of small stuff stored below the deck is just smart. I've been in the boat and had a breakdown out in the middle of the Gulfstream before, not cool. That is a long ride back to the marina behind a tow boat. Short of me having to rebuild the engine, I believe there is something in my emergency stash that can cover almost anything. But, you never really know.