As promised, here is a cage that is secured by a frenum piercing! It looks awesome and it's a breeze to take on and off. To put it on, start with the barbell in your frenum then slip the jewelry into the slots in the trough and close the lid. The jewelry is then trapped and since the balls of the jewelry are inaccessible, they can't be removed. There is ample room under the jewelry for skin, and the barbell cannot pinch the skin underneath it. Very comfortable and absolutely secure.
Yes, we can leave off the PA prong for a frenum only cage, and yes, we can adapt it to different gauges of barbells.