According to the parts diagram, the only part of the valve that is different is the front half.... the rear half, spring, and poppet share the same part numbers as the Disco.... There is no volume reducing sleeve shown inside the valve.... The transfer port is a different part number, which means it's probably smaller, maybe a LOT smaller.... The part number is CH2009-026, and we should get some as they may have lots of meat for drilling to experiment with various sizes.... The hammer spring is different, and of course the hammer is a flat-sided cylinder with a travel adjuster.... but you knew that already....

Bob