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158 THREE-DIMENSIONAL MOTION PICTURES half of Its travel for pulling down one frame of film) and a sync Indicator label is applied to the upper sprocket with a pair of the dark wedges In the vertical position. These wedges In the vertical position will then Indicate the unlocked position of the intermltten move ment and when the numbered sectors are In the vertical position, the intermittent will be In the locked or threading position. Replace the regular SH-2532 sprockets with the SH-2837 double sprockets, being careful to see that the SH-2667 woodruff key remains in the shaft. Install chain on No* 1 soundhead and gear box and adjust bracket until chain Is tight. (It may also be necessary to readjust the SH-7015 drive chain assem bly as all chains should be tight.) Turn down No. 1 machine until the No. 1 sector on the sync Indicator is centered in the vertical position and at the top of the sprocket, Turn down No. 2 machine until the No. 1 sector Is in the same relative position as on No. 1 machine* Turn chain sprocket on No* 2 (left) gear box in counter clockwise direction until it just becomes tight, taking up any end play In gear box. Install No. 2 chain and adjust to proper tension (tight) without changing posi tion of either sprocket. **' As different projectors have various amounts of overall backlash in the gear systems, it may be neces sary to compensate for this condition with a different setting of the chain sprocket, on gear box before put ting on the chain. Instead of turning the sprocket counter-clockwise until it becomes tight, it may be necessary to turn it in the clockwise direction by various amounts until a test run indicates that the sync indicators stop on the same numbered sectors. If the sectors stop one number apart,