Presser-Lifting Eccentric Place the presser-lifting eccentric (figure 4-10B) onto the arm shaft with the small end toward the face of the machine. At this time, slide the presser-lifting eccentric toward the face until it goes inside the connecting link. Feed Indicator Disc The feed indicator disc is placed on the arm shaft, through the opening in the top of the machine arm, so that the numbers on the disc may be read right side up. Push the arm shaft through the disc about 1 inch. Arm Shaft Pulley and Arm Shaft Connection Belt The arm shaft connection belt acts as a sling for the arm shaft pulley. Use the belt and lower the pulley through the opening in the top of the machine arm. Now turn the belt, while aligning the pulley with the arm shaft, and insert the shaft through the pulley. Be sure you push the shaft through as far as it will go. Arm Shaft Connection Belt Pulley Position Screw To replace the arm shaft connection belt pulley position screw, you hold the arm shaft in position with the left hand and move the arm shaft pulley to the left. Turn the arm shaft until the hole is facing up. Now turn the pulley until the hole for the position screw is facing up. Move the pulley to the right, aligning the two holes, and insert the position screw. Tighten the remaining setscrew in the pulley. Balance Wheel Before you replace the balance wheel, turn the arm shaft until the groove in the shaft is facing upward. Place the balance wheel on the arm shaft. Now turn the wheel toward the operator until the second screw is directly in line with the groove. Tighten the screw in place. Tighten the remain- ing setscrew. Balance Wheel Adjusting Screw Place the balance wheel adjusting screw in the end of the arm shaft and tighten it. Loosen it one- quarter turn and strike it with a sharp blow using a rawhide mallet. See that the balance wheel turns freely and that there is no play. If the balance wheel does not turn, or if it turns and there is side-to-side play, repeat the procedure. CAUTION This balance wheel is made of cast iron or aluminum and will break if you hit it directly with the mallet. If the screw can be removed by using your thumb and forefinger, it will be necessary to spread the end of the screw. To do this, remove the screw and spread the end of it with a screwdriver. Replace the screw and run it down until it touches the balance wheel. It should then be tightened snugly when you try to remove it with your fingers. Alternating Presser Driving Rockshaft Slide the rockshaft into the rear of the machine through the two bushings. Attach the presser- lifting link crank to the link projecting from the arm. Continue sliding the rockshaft through the crank. Set the machine on its balance wheel end. Install the bell crank link on the rockshaft stud (oil holes up). Install the oil guard into the face at this time. Needlebar Connecting Link Turn the balance wheel until the needlebar connecting link stud is at its lowest position. Grasp the needlebar connecting link so that the double cylinders are up. Place the larger of the two cylinders over the needlebar connecting link stud, and ensure that the flush end of the cylinders are facing outward. Take-up Lever Driving Stud Place the cylinder of the take-up lever driving stud over the piston of the take-up lever. Take-up Lever Grasp the take-up lever with the piston of the take-up lever driving stud and the cylinder of the take-up lever facing the face of the machine. Fit the lever into the slot designed for its operation; at the same time insert the take-up lever driving stud into the remaining cylinder of the needlebar connecting link. 4-29