In a previous life, as a contractors plant mechanic, I found the first thing to go missing on the fleet of road compressors, was the spade ignition key. The operators soon found out the engine dipstick doubled as a great ignition key. Then, when the switch no longer operated, due to the stresses put upon it, they found the same dipstick could be used jump straight across the solenoid terminals. Then, when the end of the dipstick finally burned away, too much oil was poured into the oil filler.
Then.........