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When the screw is tight it must be removed and the cap refilled, and then replaced with just sufficient turns to force the grease into the bearings.
The commutator is that part of the motor which resembles a brass wheel with its surface equally divided by many transverse sections, and which revolves on the motor spindle. It can usually be turned by hand, and if the projector is fitted with a clutch the latter should be disengaged when turning it.
Wire Belts
All belts should be removed or released when the projector is not in use, as this will prevent them from losing their elasticity. Belts which have become broken can usually be repaired quite a few times before being scrapped. It is only necessary to bend out a fresh loop from the end of the wire belt and connect it as before. In some cases a belt which has become too short for one position may be used for another, but wire belts should not be changed unless they are of the correct diameter. They should not be allowed to get rusty, but on the other hand they must not be greased if they are to be used for a friction driven take-up.
Screws and Rollers
Screws which hold idler-rollers in place are usually unscrewed in an opposite direction to the way the rollers turn when spun by the passage of the film. Both right and left-hand screws may be used in the same projector, so remember this when you find a screw sticking — try it the other way, and see which way the roller spins with the film. They are usually so designed as to tighten automatically when the roller is turned by the film.
Other rollers may be attached to springs, especially in sound projector smoothing systems, and these springs must be kept at just the right tension, being changed at once if in any way faulty.
Sprocket's
All sprockets must be periodically inspected for signs of wear and if found to be badly worn they must be at once replaced. Badly worn sprockets cause quite a lot of damage to the perforations, which in turn will cause other faults in projection —
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