1. Make a knot large enough so it will not slip through the hole in the lever.


2. With the rotor lever in the proper position, wrap the string around the stop arm between the

stop arm and the lever.


3. Make a figure 8 around the string set screw on the stop arm (string...

1. Oil rotor body and spindle.


2. Install spindle through top plate.


3. Install the stop arm and screw.


4. Install rotor and top plate into housing body aligning the notch in the top plate to the housing

and tighten locking ring.


5. Reassemble the F slide and bell secti...

Disassembling Thayer Rotary Valves


1. Prepare a clean, soft, lint and dirt free area to work.


2. Remove hand slide and all tuning slides and place bell in work area.


3. Remove all screws and/or strings connected to lever and linkages (note: do not remove the

lever from...

If cleaned often, a simple soap and water cleaning should be enough to maintain a properly working

rotor (we recommend twice a year). Over time, a rotor will develop build up which will result in poor

action. If your rotor has not been cleaned recently, first take your i...

Disassembling a rotary valve is necessary to properly clean and maintain its functionality. Some

players may be nervous about removing a rotor, but quickly become more comfortable with a little

practice. Rotors should only need to be removed for cleaning once or twice a...

Oiling Rotary Valves


Areas which require oiling on a rotary valve.


1. The Rotary Valve Body can be oiled through the shortest tubes leading to the rotor casing. This

is often done through the bell/slide receiver.


2. The Rotary Valve Spindles are oiled in two places (not...

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