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"Formerly the balls were squeezed by an "alligator" or "crocodile" squeezer, and were then "shingled" by shingling hammers, such as the "tilt" hammer (where the hammer forms a lever with the fulcrum in the middle, a cam pressing upon one end serving to depress that end and raise the other which carries the head)." — The Encyclopedia Britannica, 1893

Alligator Squeezer

"Formerly the balls were squeezed by an "alligator" or "crocodile" squeezer, and were then "shingled"…