Hauke,

I am not in New Zealand, but I can suggest your friend get in touch with a
friend of mine, who is: Alan Brehaut, 22a Cain Street, Timaru 86 8601, NZ.
His phone and fax is (03) 68-89501.  He has a number of MM instruments in
his collection and he restores as a hobby.

The AMICA membership list also shows 5 others in NZ, four of whom show
restoration or repair knowledge, in Devonport, Whakatane, and Hataitai;
the 4th, in New Plymouth, lists as his occupation Pianola sales and
repair.