I need a mechanical engineer to further refine a concept

Design details: looking for a mechanical engineer to assist with the development of a tool changing mechanism for a small desk top robot.
The tool changer needs to be small enough to fit within an 8mm diameter tube, and should clamp the tool side in all 6 degrees of freedom, whilst under in-use forces of approximately 10N, place 15cm from the tool interface. We are also concerned with keeping the mass, volume and cost of the mechanism as low as possible.

Electrical power and signalling will have to traverse the tool changer, we expect this will be possible by integrating a ring of pogo pins around the periphery of the device. We have a reasonably complete electrical spec, and can manage
designing the electronics for this ourselves, so only really need help with the mechanical design aspects (cable routing, pogo pins, etc).

We need the toolchanger to be locked/unlocked by hand, and this needs to be easy to actuate, ideally with a single hand.

I have built a small proof of concept prototype using captive ball bearings, and this does seem to meet our criteria, however the design needs some improvement before its ready for use. Current design is 3 small parts in brass, a plastic spacer, and 3 ball bearings. I can provide solidworks cad for the current prototype,

What I need doing:
I need to figure out how to route wires for pogo pins (should just involve adding grooves to one part)
I need the bearing size looked at, would smaller bearings be better?
I need a better way of clamping the mechanism closed, perhaps spring loading the cover part
I need a way of adding orientation notch (steel pin through part?)
I need a plastic shell to make it look appealing / easy to actuate
I need any diameter reduction possible

Ideally we are looking for a candidate who can take our solidworks concept, refine the design to both reduce size, and allow for electrical wiring routing, as well as produce a design for the outside of the tool changer that is appealing. The project goal is to get this to a point where we can prototype the design.

We will provide:
prototype cad in solidworks,
wiring spec,
suggested pogo pin

we expect back:
redesigned mechanism in solidworks
advice on materials, manufacturing techniques where critical


Preference is given to UK applicants for this work, as this is a condition of our funding.
Ideas for the visual style: needs to look professional
Extra notes: suggested pogo pin - 0900-0-15-20-76-14-11-0