wristwork en · NOUN
Etymology
From wrist + work.
Meanings
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(in particular, uncountable) 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.
1941 May, O. S. Nock, “The Locomotives of Sir Nigel Gresley: Part III—The "A1" Pacifics”, in Railway Magazine, pages 196–197: