Make sure you use the hex key to tighten the red nut and also the nut on the support arm. If any point of contact on the FF3 gear is loose, then this can lead to wiggle. Its important all anchor points be firm and offer no room to wiggle.
The MP2 Dual Rod Camera Mounting Plate is made for a shoulder rig kit that allows you to mount the camera directly onto it. The GB-R Rod Adapter Kit is made specifically to work with the GearBox and would need a GearBox to use it.
1. Try adjusting the height via the rod clamp (make sure you are not raising the camera on the cage).
2. If your camera is sitting to high inside the cage, then you would need to remove the battery grip(if using one). If your camera is to low, try raising your camera inside the cage via a Quick Release Plate Adapter.
3. If it still does not fit, then the MAX1 Matte Box will not work with your type of camera.
We recommend using the MP-2 Dual Rod Camera Mounting Plate. It allows you to add rails to the bottom of the Honu GH3 Cage, which you will then be able to mount accessories that require standard 15mm rails.
Remove the marking disc on the FF3 Follow Focus and you will find a small hole that has a tiny allen screw in it. Tighten that down and it should fix the problem.