Hand-cranking A Brass Car
Author: Harold & Jo Sharon
However, if one PUSHES the crank, from approximately the three o'clock position, and the crank kicks back, a thumb which straddles over the crank handle will get dislocated. Also, if the hand (the right hand, we will presume), is in the lazy man's position, with wrist bent backward, this might dislocate the wrist joint. Keep the wrist in a straight line with the forearm if you must push on the crank. Assuming a traditional clockwise cranking direction, the left handed person is at an advantage when a kick back occurs when pulling the crank. The forearm is inherently outside the crank swing, and will be clear of getting hit. Similarly, a right handed person cranking a one cylinder Cadillac (counterclockwise) is also in a safe position when pulling the crank.
For more of Harold's Great technical knowledge, check out His Book