QRS Music Technologies PMII, Installation Manual, Page: 19 / 52

Installa on Procedure
19
July 2013
Installing the Sustain Pedal Trapwork...
When you are at the point where you are ready to start removing the original trapwork system from the piano we rec ‐
ommend that you trace around the trap components before you actually remove them. This is just a good reference
should you have ques ons about leverage, stroke or placement a er you have removed everything. You should also
trace around anything else you will be removing such as the piano legs.
It is normally a good idea to install the new trap components (except for the Sostenuto) a er you install the solenoid
rail because there is only one correct place the rail can be installed, where as the trap components are somewhat fl exi ‐
ble in their placement. The fi rst is deciding if you need to mill any areas of the keybed besides the rail slot itself. The
most likely places that would require special milling would be to mill a recess for the Sostenuto actuator assembly so it
can be mounted above the solenoid rail. Another case would be to mill a pocket in the keybed to accommodate the up
most posi on of the so shi lever such as on a Steinway. You might be milling a slot perpendicular to the solenoid slot
to fi t a bridge support if you can’t leave one when you cut the main slot. Depending on the situa on you may need to
drill a new hole for the sustain dowel. It is important to realize these possibili es before you cut the slot. You don’t
want to cut the slot, clean up the mess and install the solenoid rail just to fi nd out you need to cut more material to
accommodate a piece of the trap hardware!
Once you have the slot laid out on the bo om of the keybed (we recommend using a soap stone or med p grease
pencil), it will be much easier to conceptualize how you will con fi gure the trap system. With the lines drawn exactly
where the slot will be cut, you will be able to tell what obstacles will need to be moves, modi fi ed or worked around.
For instance if you are installing a 88 note rail, you will immediately see what needs to be done to the piano legs. (you
should have traced around the legs before you remove them.) You can measure the total width of the solenoid rail and
so shi lever assembly, reference this measurement o ff the front of the slot line you drew and decide if you need to
move the lyre assembly forwards.
The chapters that follow this overview will provide explana ons and graphic details that will help you realize the ideas
behind the hardware design. For the most part, you will fi nd that the hardware we supply will adapt easily to a typical
installa on bit keep in mind that the hardware we have designed can be easily modi fi ed to adapt to unique applica ‐
ons. If bending a lever to fi t your par cular installa on fi ts the bill, then bend as needed. It’s your ingenuity that fi nal ‐
izes the hardware’s conformity.
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