Hi,
I run a shop in Hove and we are Authorised Braun Service Agents. The part you require is a chassis unit which has the plastic shaft attached to it. Probably your existing shaft has cracked?? The part is no longer available, but Im sure I have one left (somewhere in my workshop). You may also need to do a small modification to get the new chassis/shaft assy in but this is not difficult to do. If you wish to discuss this further please call me, Im normally in the shop.
Thanks
Jason
01273 734424 BRAUN SERVICE
Jason BRAUN SERVICE, October 2008