The pinon gear was missing a tooth. (See arrow in photo).

The gear is about 1/4" in diameter and 1/8" thick. The silver object in the photo is the head of an ordinary straight pin. There is a small "D" shaped piece soldered in the bottom of the gear. The pivot on which it rests has a flat filed on it that lines up with the soldered piece.
I filed the rest of the broken tooth away to get a smooth flat surface, then tinned it with solder. Next I filed a .050" X .060" rectangle on the end of a piece of 1/8" round brass and tinned one side of that. (See photo below).

The new tooth blank was cut off and soldered in place. Then came the careful work of filing the new tooth to shape. The results are shown in the last photo. The reel now runs smooth.
