Closeup of the circuit board / display. The plastic thing on the bottom are the buttons that stick out the case and transfer the force down to the micro switches on the circuit board.

Closeup of the circuit board / display. The plastic thing on the bottom are the buttons that stick out the case and transfer the force down to the micro switches on the circuit board.

The vertical and horizontal hubs are identical. On the bottom of the picture you see the outside of the hub cover and the scale printed on it to aid in the lens nodal point alignment. This scale also appears on the bottom of the unit. It's useless on the base, but like I said, the parts are identical on both hubs. The bottom or internal view of the hub is on the top of the picture. You can see the gear teeth around the edge and the rim below them that holds some of the gears from falling out. The flat surface on the top of the hub is a thrust bearing. On the bottom hub this bearing surface rests against a matching surface in the horizontal stepper motor casting. The entire weight of the unit rests on this bearing.

On the bottom of the picture you see the interier of the hub cover. Above this is the top of the hub where this cover is placed after being flipped.

The vertical stepper motor assembly with the hub removed. You see the shaft bearing surface in the upper middle of the shot. Below that you see the transfer gear and the stepper motor. The entire weight of the camera/lens that are mounted on the camera tray rests on this bearing. The plastic hub/metal shaft surfaces of the bearing makes me think you should be careful when trying to use a DSLR/lens combo. I'd be worried about wear on the plastic hub bearing.

Closeup of the transfer gear and stepper motor in the vertical assembly.

Closeup of the transfer gear and stepper motor in the vertical assembly once the hub has been place on the shaft. Note the lip on the hub that prevents the transfer gear from sliding off its bearing shaft.

Closeup of the bottom of the vertical stepper motor assembly. From here you can see the two threaded holes that are used to attach the assembly to the horizontal stepper motor assembly. Below the two holes you can see the slot that protrudes out slightly that fits into a matching slot in the base.

Looking down inside at the top of the horizontal stepper motor assembly. On the left you see the horizotal stepper motor, its gears are on the bottom of the assembly. To the right you see the alignment slot and screw holes that are used to attach the vertical stepper motor asssembly to the horizontal.

The bottom of the horizontal stepper motor assembly with the hub removed. To the left you see the stepper motor gear. In the center you see the horizontal hub shaft. The flat surface at the base of the shaft is a thrust bearing that rests against a matching flat surface on the hub. The entie weight of the unit rests upon this bearing surface.

Closeup of the gearing of the horizontal stepper motor assembly with the hub installed and the cover plate removed.

Closeup of the horizontal stepper motor assembly with the hub installed and the cover plate installed.

Closeup of the top of the servo on the camera tray.

Looking down at the camera tray.

Closeup of the top of the servo on the camera tray.

Looking down at the camera tray.