[spaghetti]

So you have a professional stringer! That's the best type indeed. Mine was just a piece of chord with a stainless steel nail. I bought it seven years ago in Sicily and was ok with it. Now I think I'll buy a full metal circular nail like yours.
I must say apart of that that I don't like to keep the stringer to the float cause I don't keep the float attached to my belt and I should swim back and forth to the float to attach the fish: I leave the float....afloat using a weight on the floatline to keep it on position, while I swim and dive within a range of 50 meters from it.