When I restore a Duo-Art Reproducing piano, I have the Holtzer-Cabot
electric motors which power the rotary pumps professionally
refurbished by an electric motor repair service.  For a fee of about
$80.00 they take apart the motor, spray the coils with insulating
material, lubricate the motor, repaint the exterior and put on a new
electrical cord.

Today, when I picked up one of my Duo-Art motors from the repair shop,
I was told that the original plug (ungrounded) is no longer "suitable"
for this kind of motor; however, they did attach the old plug to the
new line cord.  They told me that today, new plugs would have to be
of the three-pronged (e.g., grounding) variety.  Thus, while the new
electric cord to the motor is of the three wire (e.g., grounding)
variety, in the interests of preserving the original two-contact plug
it was attached to the new wire.

My question to everyone is this:  Do you have the motor rewired (and
rewire the electrical connections on the piano) to accept a three-prong
grounded plug from the Holtzer-Cabot Motor, or do you leave the wiring
the way it is with the original ungrounded two wire connection?

I would appreciate any suggestions.   Thank you.

Barry Dennis