Tippet spool retainers

[DLJeff]

Has anyone found a good way to secure the ends of tippets on these little 2.5 inch spools? They come with an elastic retainer with a metal hole from which the tippet extends. These elastic retainers work fine for a short while but they quickly stretch out of shape and before long I fight a constant battle of long loose ends of tippet tangling on everything it can find. If I have my tippet spools hung off my lumbar pack, I soon find tippet wrapping around my pack, my legs, the end of my fly rod, etc. I've tied an overhand knot in the elastic retainer, which tightens it up for awhile, but before long it is loose again.