Another must have have life saver tool is.... an impact screwdriver. Hard to find nowadays, but Princess Auto still sales them.
They're readily available on Amazon and eBay and Lowes carries the current Craftsman version.
I don't know about the quality of the new stuff, but I have a Craftsman impact tool that's almost 30 years old. I needed to do a clutch swap on the GPz550 in '92 (maybe '93) and it was a real lifesaver.
1979 KZ400 Gifted to a couple of nephews
1967 Yamaha YCS1 Bonanza
1981 Yamaha XT250H
1981 KZ440 LTD project bike
2013 Yamaha FZ6R