The lead capped screws of the taper type terminal are another of the
frequently replaced parts. Although the round knurled head type is no
longer installed, a great many men still use pliers on the square head
terminal screws with the result that the soft square lead head is
damaged to such an extent that a tight connection cannot be made.
The AMBU-Washburn Screw Mould, Figure 13, will cast standard square
edged heads on four screws in one operation, two ^5⁄_{16}-inch and two
⅜-inch. It has screw adjustments in the base, making it adaptable to any
length screw.
[Illustration: Figure 13[1]]
As the finished screws are removable from the top, the position of the
mould is not changed while in use and castings can be made at the rate
of 12 screws a minute.