Re: Good spare parts to carry.
I always carry a box of parts.
It has pretty much a spare of anything I'd likely need.
Bunch of different drumkeys, a clutch, felts/sleeves, snare cord, glue, ibuprofen, germ-x, moongels, mic claws, a couple 57's, led flashlight, a few smaller size tools, bunch of extra earplugs, pedal parts, memory locks, fold up D-Tool, an allen wrench tool.... yada yada.
Have hardly ever had to use any of the spares or tools thankfully!
Germ-X comes in handy though.