OneWay Mfg. 2170 - Oneway 4-Jaw Scroll Chuck (#2)
The levers and scroll are hardened to prevent the levers bending and the holes mis-shaping. Levers are made from high strength steel and will not deform or bend with normal use: it is important that when applying pressure that they are fully inserted in the hole. Failure to do so may cause elongation of the holes in the chuck body or scroll.
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