Sorry for the delay but I opened a bottle of Port and didn't think it was a good idea to write this up half sozzled last night!!! (Good excuse as it was my Birthday), anyway enough chatter lets look at taking the mount to bits
Bear in mind the objective here was to turn the windscreen mount in to a dash mount using a Brodit Pro-Clip but it should show you enough to achieve what you want to do.
First off the Brodit Pro-Clip with a TomTom "Ball" Attached and the donor mount:
Look at the rear of the mount and you will see two Torx head screws (size T6) remove the two screws:
Using your thumb nails seperate the front face from the mount, it doesn't take much force but is a little bit fiddly:
Remove the four T6 Torx screws that are retaining the "ball" cover plate:
The ball cover plate can now be simply pulled off the ball and set to one side:
Remove the three Torx screws that are retaining the rear ball cover.
This component is also retained to the housing by the one slightly larger "Tab" that sits in a slot at the bottom of the mount, Once its free from the actual mount simply pull this off the main ball using a little force, the mount is now fully in bits:
Reassembly is quite staight forwards, position the main housing over the Ball.
Push the rear ball cover over the ball, make sure the larger tab is correctly seated in its slot and secure with three T6 screws:
Puch the ball front cover plate back on and secure with four T6 srews:
Put the main cover back on and secure with the final two screws in the rear of the mount, here it is shown attached to a vent clip:
Finally with the device in the car:
If you get stuck just post back with some questions, I would start by taking the original mount to bits before you mess around with the accessory mount with three sockets as this will give you a better idea as to whats involved - Mike