FAQ:Replacement Potentiometer for Digitrax UT4 Throttle
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If the potentiometer (or pot) on the UT4 throttle is not working or broken, it can be replaced with a new Alps Rotary Potentiometer RK09D113000K.
It is necessary to shorten the shaft to maintain the same appearance offered by the original part.
The original part is now obsolete. The part number above is an equivalent replacement.