Simply remove the existing knob and tighten the clamp with the security knob. Once tightened, the security knob can be removed to deter theft. Garmin Oregon 200 / Garmin Oregon 300 / Garmin Oregon 400 / Garmin Oregon 450 / Garmin Oregon 550 / Garmin Oregon 600 / Garmin Oregon 650 / Garmin Oregon 700 / Garmin Oregon 750.
eBay