Replace movable finger if its diamond becomes badly worn or chipped or if the contact wings are worn to less than one-half their original length.

Lubricate the diamonds with a small amount of light grease such as Alemite.  Carefully remove old grease each time this operation is performed.

Lubricate the pivot pin with Pale semaphore oil.

3. Terminal Board - Ref. 11, P1. J112.

The terminal board is adjustable laterally by means of slotted holes where it is attached to base casting and it is to be so located that the center of the stationary contact guide (Ref. 18) is in direct line with the center of the movable finger diamond when in its free position, after leaving the movable finger stop (Ref. 15) and as it first engages contact guide (Ref. 18) in its downward stroke.

When adjustment is completed, tighten the mounting screws. Care must be taken not to over tighten the screws to avoid breakage. Where Bakelite terminal boards are used these screws may be tightened firmly.

4. Movable Finger Stop - ref. 15, Fl. J112. 
       The function of the movable finger stop is to
guide the path of the movable finger diamond.  It is to extend outward at “right angles" to the length of the terminal board and parallel verti-cally to the path of the movable diamond.  Do not bend this part unless necessary to correct an al-ready distorted adjustment.  The stop is adjustable by means of slotted holes where it is attached to the terminal board and it is to be set to pro-vide tension of l/32” against the side of the movable diamond. This holds the movable diamond 1/32" out of alignment with the stationary diamond. Do not make this adjustment until the movable finger and the terminal board have been properly adjusted.