Technical snapshots
Hardman peck wippen 1953
Nice device, with 2 springs it offers a tensioning screw.
Schwander type wippen(Hanlet 1929)
Very efficient unit for both pianist and technician.
Blüthner 1935
Wippens reacting to the absence of half the hammers.
With minor modifications a Blüthner wippen can be fit in a Steinway action...
... and vice versa wich can be very helpful if an accident happen and time becomes scarce or parts not available.
Blüthner and Steinway wippens.
Homemade hammer spring(upright piano)yet to be cut.
A simple way to check the soundboard crown with the down bearing(pressure) of the treble strings.