[ivanhoe]

I used the Carista Bluetooth plug in dongle thingy, with there app. On my phone to open and close the motor mechanism.
I purchased a piston and seal kit off ebay to refurbish the caliper.
After much cleaning of the caliper I set about fitting the seals and pistons. Ended up reusing the original pistons in the end. The new ones were not chamfered enough to push through the seals without tearing them. They were budweg pistons, I would try a different brand next time. You do need to give the seal groove a thorough cleaning out.
How the motor mechanism works is very simple, nothing to be worried about.