action reg puzzler on M & H BB

[Ric Brekne]

Ok.. I am not quite sure I get your drift here... you say that if you 
play hard then the

    "hammer will get caught on it's way /back up/ by the back check"

Do you mean that after some number of continuous problem free hard blows 
the hammer suddenly gets hung up on the back check on a new hard blow ?  
As in you can suddenly feel your finger jam on the key cuz the jack is 
pushing up on a hammer tail that suddenly has become jammed in the back 
check ?

If so... thats very strange indeed. 

RicB



List -
   
I am having a puzzling problem with a M & H BB grand action that I have 
never encountered.  Complete regulation (w/new shanks& hammers), 
everything works great with the exception of 3 notes - F6, A#6, G7 -  in 
the high treble.  I cannot get this to happen on the bench, and even in 
the piano when the notes are played softly, even in a trill, they 
perform perfectly.  However, under continuous mf - ff blows, as in 
tuning, after anywhere from 1 to 10 strikes (letting the key all the way 
up), the hammer will get caught on it's way back up by the back check, 
thereby not allowing it to strike.
   
.............
  Mark Potter