Replacement on/off switch for your Telrad. Simply replaces the current on and off switch on the side of your Telrad finder.
Attaching the plastic knob: Included plastic knob press fits over the potentiometer switch. Make sure the unit is switched off. Slide the plastic knob over the knurled shaft of the potentiometer until resistance is met. Then, with the unit lying on its side for support, point the handle to "off" and press it for the remaining distance to engage the short section of interference fit.