So back to your original post, is the objective to lower the 20V to 14V because the banjo is "hyper-active" at 20V? I assume this is a vibrating-type mechanism(?)
There have been reports of some success by simply installing a 10-cent diode in the red wire from the D post to the banjo. This cuts the power applied to the banjo in half...but still applies the pulsing voltage that vibrates the electro-mechanism and hence swings the arm.
