The fundamental difference between the two is that Keynes is something of a tinkerer.
He was a natural mechanic, a maker and tinkerer of machines; he lisped in blueprints for the blueprints came.
He was something of a tinkerer, and he enjoyed adapting his environment to himself.
It was standard for the tinkerer, for the would-be designer of robot bodies.
"mender of kettles, pots, pans, etc.," mid-13c. (as a surname), of uncertain origin. Some connect the word with the sound made by light hammering on metal. The verb meaning "to keep busy in a useless way" is first found 1650s. Tinker's damn "something slight and worthless" is from 1824, probably simply preserving tinkers' reputation for free and casual use of profanity; more elaborate derivations exist, but seem to be just-so stories without evidence.