wristwork
Etymology
From wrist + work.
wristwork means movement of the hand without movement of the arm. Lexicurio rates it Sui generis — a strength score of 89 out of 100.
noun
- movement of the hand without movement of the arm“[...] in actual fact the Gresley Pacifics are not difficult to fire; the accurate wristwork needed to shoot the coal into the back corners of the grate calls for knack rather than brute force.”