weight of the wippen, extension, jack, etc., when the key is released.
Thus the bridle becomes the main factor in the matter of quick
repetition.

_Bl W_, bridle wire, screwed into wippen, bent in the shape of a
buckle at top to hold bridle.

_Bt_, butt; or, more specifically, hammer butt. In some cheap actions
the butt is joined to its flange _g_, by the means described under the
head of wippen flange; but in this action the center-pin is held
firmly in the butt by a small strip of brass containing a set screw;
somewhat obscure in the cut, but discernible. As explained elsewhere,
all center-pins turn in the flange and not in the middle part.

_HS_, hammer shank in rest position.

_H_, hammer showing wood body or head, and covering of two layers of
felt.

_H R_, hammer rail, resting on felt cushion, _c_, glued to rail or
bracket. The hammer rail is held in position by the rod, shown under
the hammer shank, which is hinged to the bracket at the lower end, and
which allows it to be moved forward when the soft pedal is used. The
soft pedal communicates with this rail by a rod which moves it forward
and thereby shortens the stroke of the hammers and produces a softer
tone.

_sr_, spring rail screwed to the brackets. This rail supports the
light wire springs which assist the hammers in returning to rest
position.