A knob for mounting on a control lever includes a knob body and a cavity formed in the knob body extending from a lower end of the knob body having a lower opening. The knob also includes a cantilever arm within the cavity connected to an interior connection portion of the knob body remote from the lower opening and extending substantial parallel to an interior of the knob body to the lower opening. The cantilever arm includes a projection formed on a side of the cantilever arm to engage a connecting portion of the control lever.