Soundboard mass decisions

[jimialeggio5 at comcast.net]

When adding mass to the high treble, sometimes there is no access underneath the 
board.

I assume that finding a way to attach some mass here is basically "by hook or by 
crook".  Correct?

For instance, since its relatively easy to access the front vertical surface of 
the high treble bridge from the action cavity,
would there be any reason not to apply a nicely fit piece of bar stock to this 
surface?  Or...is there any reason weight could not be mounted on the top 
surface of the board, as close to the bridge as possible?

This brings a second question to mind, regarding bridge mass and or stiffness, 
as it relates to the seriously undercut bridge root often found in original 
bridge roots. This undercut bridge root which results in mass removal and loss 
of stiffness, combined with the tapered board up in the treble,  seems to be 
chasing flexibility and low mass...something very different from what the thread 
is discussing.  

What were they up to?

Jim I