Tapped L wing tiedown hole for tiedown ring, using a 3/8"-16 tap, 1" deep. Test-fit the titanium tiedown ring. It fits great! (Due to a pre-existing gap between the face of the AEX tiedown block and the skin, the ring will probably not be able to be tightened down completely when it's in use. Such is the nature of the Quickbuild kit. I will also investigate some kind of anti-scratch rubber ring to put under the shoulder of the ring.) (For those interested, the titanium rings are less than half the weight of a steel one, and they're stronger. I got them from McMaster-Carr, but unfortunately as of 2011, they were discontinued from their inventory.)