Hi Bill,
They could have stayed it a bit better in the specs. The dolly places the bottom of the piano at 3/4" from the floor. If the initial height is 3/4" then it doesn't change. If the casters had it higher than 3/4" then it lowers the piano by the net difference. If the casters had the piano lower than 3/4" than the stage Dollie's would raise it by the net amount. If it winds up a little low you can always shim.
I've taken some measurements, in the past, of at-rest pedal height from the floor, bottom-of-the-keybed height from the floor, and natural key (at rest) from the floor (on various major brands) with the result being much more wide-ranging than I expected. (Sorry for all the parentheses but I was trying to be accurate.)
I hope this helps. Short answer: look at the net difference relative to the resulting 3/4".
Be well,
AG
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Allan Gilreath, RPT
Registered Piano Technician & President
Allan Gilreath & Associates, Inc
Calhoun, GA
706-602-7667
allan@allangilreath.com -
www.allangilreath.com------------------------------