Replacement Braun Multipractic spindle?

Unfortunately, whilst the motor on this food processsing machine is still pushing out full power after some 20 years or more, the plastic drive spindle covering has sheared, half-way up - just where the round shaft becomes the driving hexagonal shaft.
I have tried to repair with hardening epoxy material - but am not confident this will work.
It seems that such a replacement part is not now available.
Does anybody have a similar machine which is no good any more but has the spindle intact, please.
Multipractic model number is 4258.
Many thanks for any help available out there!