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Editing Step 23 —

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Gather the Black housing assembly.

Place the Idler lever on the motor shaft with the arrow pointing away from the mount.

Place the thumb screw assembly into the groove, and make sure the spring locates onto the lump on the idler lever to secure it in place.

Rotate the thumb screw to apply some tension to the Idler lever.

Don't apply too much tension st this point or you will risk the spring popping our and potentially damaging your eyes.