Here are Western Electric   telephone bell screws that are freshly polished. These are 10-32 x 1/4" slotted round head brass screws that we   nickel plate for telephone apparatus use. They fit Western Electric 317 wooden wall phone ringer bells, 334, 634 and 534A subsets and many and most ringer applications.

You receive 2 screws and 2 lock washers both made from brass and then plated. They will also fit Stromberg Carlson and Automatic Electric Ringer box ringers.