The heart of the Acolyte derailleur is our innovative SpringLock system. By pairing a customized linear rate high tension spring and a dual stage activation mechanism, weve developed a system that can provide substantial chain security when you need it and can be turned off when you dont. To engage the clutch, turn the engagement bolt clockwise until it clicks. Theres no way to overtighten the bolt. To disengage the clutch for wheel removal, flip the switch. Its that simple.