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FOR MANAGERS AND OPERATORS 131 in the hub of the small gear wheel. The shaft will then slip out to the left, releasing the gear and sprocket, together with the brass chute through which the film passes to the lower magazine. Next remove the film slide. The film slide is the plate covering the gate side of the machine and ex- tending down between the flanges of the intermittent sprocket into and through the lower film loop recess. This plate is removed by taking out one screw at its lower end iriime- diately behind where the lower sprocket was; one flat head screw on either side just above the steel bars holding the intermittent bearings, and the two gate latch screws. Next unscrew the two steel caps which hold the bronze boxes of the intermittent shaft and the star wheel and its shaft may be lifted out. When replacing the intermittent sprocket, star and shaft be sure that both bronze bushings or bearings are in line, that is to say, be sure that both these bushings set precisely the same so that the shaft is held exactly parallel with the cam shaft. This, as has been before explained, and is fur- ther explained and illustrated on page io8, is of the utmost importance. Other than this the replacing of the star shaft is merely a reversal of the process of its removal, except that when screwing on the cap nearest the star wheel be sure to tighten the upper screw as tight as possible first; then the other three screws may be tightened a little at a time. Also be careful, as has been before noted, that the intermittent sprocket is in exact line with the aperture plate film track. To install a new revolving shutter you must take j'our machine apart just as has been already described for the removal of the star shaft. You must also remove the middle shaft, that is to say. the large shaft immediately behind the intermittent shaft. This is done by removing the taper pins in the hubs of the three gears it carries and driving the shaft out. The first thing is, set the framing device exactly half way of its travel, or so that the handle is parallel with the base of the machine. Next see that your aperture plate is screwed on in its place. Then the center of the cam pin which drives the star wheel must be set in the center of the intermittent sprocket bearing. Then set your shutter so that the center of the shutter is in line with the center of your aperture plate. When a new shutter is sent out it is set and pinned on the shaft so that it will be in correct position when installed in the machine, but you must experiment by