Brake drums on mechanisms that have been shopped since March 1947 will have the brake drums doweled in the proper position and these are not to be moved.

On mechanisms equipped with single brake spring shown as Ref. 8 in "A” plate J204 , the tension of the spring is to be adjusted so that when the wigwag is operating at normal voltage and the operating circuit then opened, the movable finger diamond will be heard to snap past the end of the stationary diamond not less than three or more than four times.  Spring tension is adjustable by means of screw (Ref. 9) which attaches spring to base casting.

On mechanisms equipped with double springs as shown in Fig. 1 the same braking action as described for the single string is required.  To adjust first turn both spring supporting screws upward until springs are slack, then hold the brake band so that it is centered in relation to the armature and turn each screw downward until the turns in the spring lust start to separate. If further adjustment is necessary turn each screw equally.

7. Ribbons are to be installed as shown in Fig. 6 with the loop and connections pointing toward the outside door.  Replace ribbons if breakage of the fine strands has started to develop.  Ribbons are to be somewhat shortened from their full extended length by uniformly bunching the weave together are to be carefully trained in a position that prevents contact with other parts.