Genuine Teenage Engineering OP-1 Crank - the hand-crank accessory that turns the OP-1's tape into a literal crank-driven machine. Discontinued along with the original OP-1 and increasingly hard to find.

What it does: press the blue mounting top onto the OP-1's blue encoder shaft, then Shift + Rec to arm crank mode. Turning the crank drives tape speed by hand - wind it slow for warped, wobbling pitch, crank it fast to chase the beat, or turn it counter-clockwise to record in reverse in real time. Select it in the LFO menu and it becomes a hand-driven modulation source for any parameter. It also turns the Endless Sequencer into a hand-cranked music box: hold the notes, crank the rhythm.

What is included: the white crank arm with its integrated handle, and one blue mounting top (installed). Blue is the correct and only top you need - the crank is designed to mount on the OP-1's blue knob. The original retail pack shipped with four interchangeable colored tops; the other three (orange, white, green) are not included here. No box.

Condition: Very Good. Fully functional, mounts and cranks correctly. The white plastic carries light handling scuffs and one shallow surface scratch on the arm, visible in the photos. The blue top is clean and grips the shaft firmly.

Compatible with: Teenage Engineering OP-1 (original generation). Not compatible with the OP-1 Field, which has no crank support.

Ships USPS in a padded envelope, packed so the arm cannot flex in transit. Ships fast and well packed from North Carolina.