<HTML> Hello Phil F. and Richard B.     Phil !  there are at least two (2) other  methods that  were used  in the  past  that  were successful.    Sorry Richard !  but both are viable        The latest one used was in the " P.A. Starck " verticals in the 1960-61-62 time frame.  This was also after the J.P. Seeburg Organ  Co. bought Starck.       Under the key at the very back, an upright ( jack) let off rail was secured to the a wooden rail with  a let-of button and felt facing up under each key. The key height was adjusted by turning the let off button up or down. This was in their consols and spinets.    The down side being that after this was adjusted you then had to adjust the capstan.           The second method was in a  "Bowen-Henderson"  1920s grand and perhaps others. This method used a  "Jumbo" type drop screw that was inserted thru the key just in front of the center rail pin.  Of course the adjusting end of this screw was on top of the key.  There was no punching of any type.   There was a strip of action cloth about a quarter inch wide in front of the center pins.  And to answer the most logical question, no,, there was no pulley keys and the piano was well used.      I demonstrate one of these in the  "Action History Class" that I give for the PTG. Foundation Regards, Jack Wyatt </HTML>