"My zoom gear is not working - what am I doing wrong?"
In order for your zoom adjustment to work properly you need to correctly position gear on the lens. For this, set the zoom on your lens to the smallest focal distance. Then you push the gear with the tooth in the direction of the lens bayonet in accordance with the white mark on the smallest focal distance on the lens. The gap to the camera with a properly mounted gear should be approximately 10mm. Then secure the gear with the IS screw and check the appropriate pinion contact. For contact on both conversion wheels just alter the distance between the ring and the camera until the desired conversion wheel has full contact.