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MANAGERS AND PROJECTIONISTS 721
INSTRUCTION NO. 28.— REMOVING FILM TRAP COMPLETE. — Should it ever become necessary to remove the entire film trap assemblage, E-l, P.I., as a unit, it may be done by taking out the two large screws S-133-C, P. 4, and S-514-C, P. 3, which releases the whole thing, but it is best to first remove the door, as per Instruction No. 1, to avoid possibility of damage to intermittent sprocket.
In reassembling it is absolutely necessary that the unit be accurately placed and lined, else the aperture will not be square with the lens. Have the engaging surfaces perfectly clean. Place the part in position engaging it with the locating pins and starting the two holding screws, tightening them down, but not solidly. Next (IMPORTANT), with the gate shoved back (open), place a straight-edge of metal, such as a machinist's six inchc rule (seale) on the film traik, or "trap shoe" as the Simplex folks lall it, letting the straightedge project down past the sprocket. If the part is in line when the straight-edge lies flat on the film track, it will just touch the face of the intermittent sprocket. If the rule rests on sprocnet face and is held away from lower end of film track, or if it rests on track but does not touch face of sprocket, tap casting forward or back nntil track and sprocket face are exactly in line. When this is done, tighten up the two holding screws tight.
NOTE. — Since the lens holder and film trap must be re-aligned, and special tools are necessary to this operation. We advise against removal of the film trap except when absolutely necessary.
INSTRUCTION NO. 29.— TO REMOVE FILM TRAP STUD S-134-E, P.2.— This is the thing you shove the gate, or door, open with. To remove it is a simple matter. The knurled knob at its end looks like it is one with the nickeled stud, but it is not. What seems to be a nickeled stud extending into the casting is only a thimble of thin metal covering the steel stud beneath. It is held by the knurled knob. Wrap the knurled knob with either cloth or paper, to prevent marring its surface, and grasping it with a gas plyer unscrew it. It is an ordinary right hand thread. It holds a light, rather long coil spring under compression. The spring is between the nickeled thimble and the stud. Having removed the screw, take off the thimble and spring. You must next follow instruction No. 28 (or you may do this first), after which the stud and entire gate will be released. To reassemble, note reassembling instruction under Instruction No. 28.
INSTRUCTION NO. 30.— REPLACEMENT OF FILM TRACK SHOES.— Film track shoes, S-309-E, P.5, are subject to very heavy wear, and as soon as there is appreciable wear they should be removed and replaced with new ones, other