I am presently trying to find out the whereabouts of a keyboard to slot
in the back of a keyless Welte.  One is pictured in a Ord Humes book
Pianola. While I was training as a piano builder, under someone
who worked for Steinways of London,  I was told that he used to carry
such a keyboard to tune and regulate these instruments as part of his
tuning kit while he was based at Steinways.

What we would like to do is to have accurate dimensions of an original
so that we could commission a copy from a piano action builder.

Any help would be appreciated.

Jonathan Holmes
UK