A vibrator(56A), including: a bar(16), a first location(64A) therealong including a first pivotal connection(20A) to the chassis(62) of the vibrator; a weight(14) including a second pivotal connection(20B) to a second location(64B) of the bar(16); and a motor(12), for rotating(70) the weight(14) about the second pivotal connection(20B), thereby converting the weight rotation(70) to back and forth linear motion(54), thereby the back and forth linear motion(54) is characterized by the distance between the first(64A) and second(64B) locations.
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