A small adjustment screw was provided, to allow fine tuning of the audio output.
In his hand was the key which loosened the all-decisive adjustment screw.
One would bring the upper roll down to the plate by turning a single adjustment screw.
If the user needed to add pressure on one end of the roll, he could simply turn the appropriate adjustment screw.
The vertical position of the pressure plates is usually controlled by an adjustment screw.
There is usually an aziumuth adjustment screw for each position.
There are usually two adjustment screws controlling the limits of lateral travel allowed.
The weight is adjusted with the adjustment screw until the periods are equal.
Unlike the other valves, this one has an adjustment screw, not a handle, on top.