Bill Garfield wrote in 000116 MMD:

> Grandpa Willy ... stayed in close contact with his dear friend and
> neighbor (whose name we've so far been unable to track down ... )

If you wish to pursue the name of the neighbor, you might get a city
directory from the years Grampa lived next to the piano tech.  This
book, found at the local library in either page or microfiche form,
will list the people living at each address in the city and often will
note what their profession was.  I've done some research of this type
before.

D. L. Bullock    Piano World    St. Louis