Electronica Washburn woodstock studio EA40

[Rohow]

Hello All,
I Have a Washburn EA40 with a neck and pieso element.
With a slide pot on the electronica you can swith thru the neck or pieso element.
The slide pot M 500 K B 46 1 is unfortunately defect.
I can't find these anywhere.
is there anyone who can advise me.