Damper flange tray screw

[Jessica Masse]

I'm not sure about Boston but I had to do this on a Kawai.  Terribly 
difficult, but possible on that piano.  You can purchase an off set 
rachet screwdriver set what you normally buy is a tool with double ended 
screw tips.  I had to convert mine for rocker style capstans and 
something else.  I ground down a different tip  ( it was too tall for 
the space ) and I had to add a pipe for an extension to the handle. 

For the damper tray flange screw you may or may not need this tool but I 
think I used it on the Kawai for some reason.  But I remember the trick 
was to force the damper tray up as high as it would go.  In order to do 
this you need to unfasten the damper stop rail and may even need to 
remove its screws and push it up as high as it will go. Yes, I remember 
something else you will also need to remove the sustenuto rail.  Then 
you may be able to get at the flange screw with a regular screw driver 
or other.

Good Luck!