After only one pass through the ring, come through the bight of the cuff and make a slipped half-hitch against the bight. Then drop a half hitch loop over the bight of the slipped half hitch to lock -- but it can still be released with one hand by pulling on the uncrossed side of the final half hitch.

This technique should only be used for secondary support lines which are not safety-critical and not heavily loaded; it is neither secure enough nor sufficiently resistant to jamming for use on primary load-bearing lines. It also provides poor control of a large load when being untied.