Following are the instructions for adding the Encoder 802-004, which is the 0.25" SHAFT, 500 LINE ENCODER for stepper motors. Attached is the original PDF.
NOTE: S3 & S4 motors require cover mod. for cable
The LDA encoder is designed for installation directly on the motor shaft. It provides a factory pre-assembled feature that eliminates the need for any adjustment of disc gap, disc alignment, symmetry and phasing while installing it on the motor shaft.