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Since 9/00) -55- Note: In the following step, take care to keep the shaft keys in place during the change gear exchanges. Threading 4. Remove the cap screws, lock washers, and flat washers that secure the top and bottom change gears, install the correct gears as directed by the threading or feed rate charts, then secure them in place with the removed fasteners. To prevent binding the gears, do not over-tighten the cap screws—they merely hold the gears in place. Note: The top change gear enga