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Secure base to mounting surface using two or three screws. If a centering tool is used, slip it over shaft and into center hole of base. Tighten mounting screws, remove centering tool.
For shafts less than 3/8", snap spacer tool clip around shaft. (Fig. A) For shafts equal to or larger than 3/8", place spacer tool next to shaft. (Fig. B)
Slip codewheel over shaft with disk side down until it bottoms out against spacer tool. Tighten set screw with hex wrench provided while pressing down on hub.
Slip optical module into position until two alignment pins slip into holes of module. Thick side side of module should be out.
Place cover over assembly and secure with two 4-40 x 5/8" screws (supplied).