I wonder if anyone can dig out a bit of a Duo-Art regulator?

These are the knife valves, which have gone missing! The project belongs
to the Musical Museum in Brentford, and I offered to complete the work
after the previous volunteer left. Despite extensive searching of the
workshop, the missing parts haven't been located.

The piano is a London-made electric-only Steinway grand. In the UK, most
Duo-Arts were either pedal-electric or pedal-only, and, rather to my
surprise, the knife valves for these are quite a different size and cannot
be reworked to fit.  The knives and face blocks are a different size, the
knife centers are in different places and the ports in the face block are
different. Everyone I know in the UK has PEDA and PDA spares, but no EDAs!

I rather suspect that the EDA regulators made in London are the same as
those made in America. If so, hopefully, parts from an American regulator
might fit. The reason I suspect this is that this EDA box was glued
together as the books describe, while the PEDA and PDA regulators are of
a completely different design, not glued but screwed and gasketed. So,
London probably used the original EDA pattern.

The pictures are from another sample London EDA regulator. One shows exactly
what's needed -- both theme and accompaniment side. Nothing else is missing.
The other picture illustrates the size of the mount of the face block.

Julian Dyer, London
julian@pianorolls.co.uk.geentroep [delete ".geentroep" to reply] 

 [ Brentford regulator, showing size
 [ https://www.mmdigest.com/Attachments/25/02/09/mime.250210_002509_julian@pianorolls.co.uk.Brentford%20regulator%20showing%20size.jpg 

 [ Brentofrd regulator, missing parts
 [ https://www.mmdigest.com/Attachments/25/02/09/mime.250210_002509_julian@pianorolls.co.uk.Brentford%20regulator%20missing%20parts.jpg