Born as a basement job shop in Euclid in 1966, JM Performance Products now manufactures patented High Torque retention knobs and related tooling products for optimizing CNC milling machines. Owner John Stoneback developed the retention-knob design to address toolholder expansion in V-flange tooling, then shifted the company from contract machining to its own products and renamed it JM Performance Products in 2013. The company operates from a six-acre Fairport Harbor, Ohio facility built in 1991.