[lukevanoort]

I would say miter saw, but then I got to thinking, instead of what is the most useful at the time, what would be the worst to be stuck without for the season. You can substitute other things for wrenches and such, but the thing we actually ran out of and spent the last 3 or so days of build season without tops my list, zip ties. Without them electrical work ground to a halt as did prototyping mounts.