Sorry, wasn't trying to be secretive! It's simply a pair of wraps on each end, made of bowstring material or leather etc that are tied around the bow tip then soaked in glue. The wraps are quite close to the ends of the bow, and the string loop just goes over the tip itself when bracing, to rest against the wraps. It means that when unstringing the loops don't slip down the bow limb, but are lifted over the tip and off the bow completely.
I have zero experience doing it myself but will be experimenting with it. The guy who did it used it on a 90# yew bow with no problems, and it would seem that it's a popular method in other cultures.
I suppose there may be a limit in its use, both in the force against the glued wrap at higher poundage and the method of stringing as you can't use a stringer with it. The latter can be avoided however with various stringing methods such as bracing against something solid or even just the step through method which I've seen used on bows over 140#.