If the CRANK! counter is on Sprocket 1, it moves to Sprocket 2. Sprocket 2 to sprocket 3, and Sprocket 3 to Sprocket 1, as normal.
2018-01-19 • wotc
To crank a Contraption causes its ability to trigger and go on the stack, similar to what happens at the beginning of your turn normally.
2018-01-19 • wotc