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494 HANDBOOK OF PROJECTION FOR
9, P. 3. Let them hang by their pig tails, so that you will get them back in the right holder. Remove bolts, 4, P. 1 (four of them), whereupon the bracket may be pulled away.
CAUTION. — The four hexagon-headed bolts extend through and hold the plate covering the inside end of the grease chamber. This cover will sometimes stick slightly. Before removing the bolts, but after having backed them out for three or four turns, tap on them lightly with a hammer, in order to loosen the inside grease chamber cover.
NO. 11.— TO REMOVE BRUSH YOKE, 6, P. 2, follow Instruction No. 10, then loosen screw, 7, P. 2, whereupon you may pull away 'the yoke, carrying all the brushholders.
NO. 12.— BRUSHHOLDER STUD.— Should it ever be necessary to remove brushholder stud, 8, P. 2, it may be done by loosening nut, 10, P. 2, but if you do this, be very careful in reassembling that the insulation, which consists of two mica washers, 9, P. 2, and a mica sleeve around the bolt, be not in any way injured. If this insulation is not perfect, then the whole frame of the machine will be charged with potential. In loosening these parts it will be well to remove nut 10, P. 2, and thoroughly clean the contact between it and the copper clip to which the wire is connected. In reassembling be sure to set up nut 10, tight, else you will not have good electrical contact; also it is essential that the lock nut behind nut 10, which holds the insulation in place, be set up tight, else the brushholder stud will vibrate and thus cause trouble.
NO. 13.— BRUSHHOLDER, 12, P. 2, may be slipped off at any time by loosening screw 16, P. 2. Before taking off the brushholder you should make a scratch mark at its end on the stud, so that in reassembling you may get it back in exactly the same position it formerly occupied.
NO. 14.— CARE OF THE COMMUTATOR.— (See General Instruction No. 8.)
NO. 15.— TO INSTALL NEW BRUSHES.— First raise finger 16, P. 1 (shown better at 9, P. 3), and remove the screw holding the end of the pig tail to the brass casting, then lift out the brush, put in the new one and attach its pig tail to the casting the same as the old one was. The face of the new brush must be ground to fit to the curve of the commutator. To do this lift out all the brushes you are not replacing, then place on the commutator, sand side out, a strip of No. y2 sandpaper long enough to extend one and onehalf times around its circumference. Lower the new brush