The Torshear bolting method was not a commercial success, so 'North Bar' added reaction arms to their gearboxes and called them 'Pneutorque' in the case of the air-driven versions, and the hand-operated versions were named 'Handtorque'. Evolutions of these products still form part of the company's range today.Norbar Torque Official website – Products page “” Dr. Merritt's book 'Gears' remains a reference for gearbox designers.
