Gold Tip Lock Nock for X-Cutter, Flo. Green. Gold Tip Lock Nocks are the first patented lockable nock system. This system securely positions the nock with absolute precision without glues, epoxies or other adhesives. Adjustments for vane clearance can be made quickly by loosening a small Allen screw in the notch of the nock. One Dozen. Gold Tip Lock Nock for X-Cutter Flo Green.