Rover owners: Help with VIS motors please?

Hi,

I bought a spare inlet manifold the other week, and decided to crack open the VIS motors from it.

Firstly, can anyone confirm the motors from a ZT are the same as those used on the ZS KV6? I assume they are.

Secondly, just so I know which motors are which, which one is the power and which one is the balance? Is the one nearest the bulkhead the balance?

Thirdly, I have opened both motor units. Now, after reading so much about at least one of them will be full of oil, I find that neither are. They are both dry inside. I guess this is a good sign?

Since they are open, I figured I could do the re-soldering people mention, even if not required, as a simple operation to improve longevity of the unit. Now, the walk throughs I've seen simply say something along the lines of " remove the worm screw and take out the circuit board".

Any tips on how to remove the screw threads?? Can't budge either! I don't want to damage the threads themselves, nor do I want to break the plastic clips that the threads are held in place by.

Is the circuit board held in place by anything? Can't see any attachments.

Anyway, photos attached of the insides.

Thanks to anyone that can offer some advice!