[pianotech] damper tray support

[Gene Nelson]

If you move the axis forward in line with the damper lever centers the bulk 
of the weight of the assembly moves toward the rear and the tray will almost 
want to tilt backwards left to its own devices.  Thus the addition of a 
second spring is necessary.  I find something intuitively wrong with this 
set up.  It does seem to work more smoothly because there is less weight 
bearing on the pedal.  It also forces the addition of spring resistance in 
place of actual weight.  I'm not sure that's a better system.

**** I tend to agree. I believe that lift lever/damper return springs also 
contributes to this - if you use them.
It is easy enough to get the tray to return with one spring but the second 
one or a slightly stronger one gets the lost motion. Its like the single 
tray coil return spring comes to equalibrium with the damper/lift lever 
return springs just at the point where the dampers come to rest on the 
strings.
 I believe that the nature of the replacement kit is partly to blame for 
this - not that the kit is made wrong, it is just made wrong for this sort 
of application.
I hear that the new parts maker will soon market one and it may be more 
frendly for this sort of thing.
Gene