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This accessory is a component of the E4TQ Series ChangeDisk rotating disk electrode tip, available separately as a replacement or an additional component of the assembly. This piece is called the internal disk contact pin. One end of the internal disk contact is threaded so that it may be connected to an RDE/RCE Shaft for 12 mm OD tips (MSR Rotator Family), RDE/RCE Shaft for 12 mm OD tips (ASR) shaft. The disk contact will also thread into the built-in shaft on a Pine Research CPR rotator.