Steingraeber factory pictures, bridge agraffes & adjustable vertical hitchpins

[Jean-Jacques GRANAS]

Hello all,

I am not an expert at all this, but it seems to me that in any case – be it 
traditional bridge pins, Paulello agraffes, Steingraeber agraffes, or any 
other – the primary force exerted upon the bridge by the strings is a 
downward one, on account of downbearing (supposing the piano has any to 
begin with). In the case of tranditional bridge pins, the force exerted by 
the string against the front bridge pin and against the rear one would tand 
to cancel each other out, is that not the case?  

Jean-Jacques Granas
Warsaw