I have to replace a Crossfader from a Native Instruments S4 Contoller.
i dont find a replacement on worldwide electronics seller. (mouser, conrad, reichelt, etc.)
a Repair from Native Instruments costs arround 70€.
I have found on ebay.com a replace crossfader , ~18€ inkl. shipping,
the ebay replacement fader dont have the same pin size, so i had changes the pins with pliers to get the same pinsize. (see picture 1)
Native Instruments S4 Crossafder Gallery