On 21 Mar, 23:35, Tech Support wrote:

Don't bitch.The P-51, with Merlin engine, had one set of tools for
engine and another set for airplane. That was back in 40's (WWII) )
Crew chief carried two bags when he went to work on bird.

The Citroen 2CV came with two (I think, may have been three) spanners
which allowed you to do anything up to and including a full engine
rebuild.

Ian