Originally Posted by TeeDee
As with most things in life, the devil is in the details.
The security of any knot depends on both the application and the material used to tie the knot.
The main problem in using the girth hitch, aka Larks Head, in this application is the webbing and not the knot itself. Webbing can be very stiff, i.e., hard to bend. That stiffness of the webbing causes the webbing to not only resist bending, but also to attempt to return to it's original unbent form. In attempting to tie the girth hitch around the ring, the radius of the bends is small and the resistance to bending commensurately larger and the forces attempting to return the webbing to the unbent form larger. In this application, the forces can actually be large enough to undo the knot enough that the webbing will slip off the ring entirely when unloaded.
Yup. That's why I locked down the girth hitch, as described in post 61, center image. One can also lock it down using the load bearing strand of the webbing. That's very secure as the load locks it tighter. But, you need to use the "other" (long) end to make that knot and you may not have access to that end. For a one time "permanent" ring attachment that's less of a problem.