Double-striking hammers

[Ted Simmons]

I have a Yamaha C3 that has several double-striking hammers.  When I  
pull  the action forward  just a little (about 1/4 inch) the double- 
striking stops.  I regulated this piano on my bench and this is the  
what I found after I reinstalled it. It worked fine on my bench.  Any  
help would be appreciated.
Ted Simmons