Gee where do you start. I based my boat in Scarborough marina for two years to make heading north easier. The spares were simply filters,belts,impellers,oil,auto trans fluid, hoses and clamps ,assorted stainless screws,bolts,washers etc, rigging spares as in split pins, extra rigging wire and swages. Electrical wire,solder and soldering iron,battery leads ,fuses, globes, epoxy and fibreglass resins , glass Matt, a small sheet of marine ply,aluminium flat bar,stainless flat bar, stainless threaded rod and nuts ,washers to suit. Drill bits,hacksaw,circular saw,grinder,drill,multi tool ,jig saw etc . Bolt cutters just in case. I dedicated one locker to spares and another for tools. Standard tools were carried,socket sets,Allen keys etc, maybe I carry too much ,but I am a fitter as well as an electrician. Did I use them . Yes . Fixed a mates boat, replaced the rear bulkhead in mine when I found some rot. Installed an anchor winch ,all without the stress of not having tools and the gear to fix it. The most important thing was the "bits bag" you know the bag where all those left over cable ties ,screws etc go. Every thing you needed seemed to be in there.