I am posting this as a matter of clarification.  The Ampico "Motor
Mounts" that have been in discussion the last several days are really
not motor mounts.  The item of discussion is the rubber sound isolator
that holds the _rod ends_ that the motor mount slides on.

The true motor mounts are castings that cradle the motor.  The
castings, top and bottom, are attached by wood screws to wooden spacer
blocks.  These wooden blocks slide on 3/8-inch-diameter steel rods.
The ends of the rods (4) are mounted in rubber sound isolators that are
held in steel brackets affixed to the piano rim or beams.  It is this
rubber sound isolator at each rod end that is being discussed.  The
shape of these isolators must conform to the shape of the brackets that
attach to the piano.

The true motor mount, as stated above, is a casting that cradles the
electric motor.  The motor is isolated from its mount, the casting, by
felt.  This cradle mount was first introduced around 1922 and remained
in grand pianos until the end of production.

Bob Taylor