Abstract: Saw apparatus including an elongate power-driven saw arbor, and a collar mounting a saw encircling the arbor and slidable axially on the arbor. The collar is moved axially on the arbor to shift the position of the saw by an elongate shifter bar seating within a channel extending along the arbor, the bar being connected to the collar through an attachment which provides a single anchoring connection of the collar and shifter bar. This enables centrifugal force produced with rotation of the arbor to maintain the plane of the saw collar normal to the axis of the arbor.