When you get down in those smaller size heads that are doodad heads with pointed noses and recessed eye sockets which makes them thin to start with then you have to add enough lead to hold the wire or you would be defeating the whole purpose to start with. Try just weighing the head with NO HOOK AND NO WIRE...they dont base their weight on that being in there...just on the weight of the lead itself...there is many many many factors when you go to weighing heads....things you cant control and never will be able too...not saying you or I could not make a 1\48 or close to it with a wire insert but some things would have to change the get close to that weight...like a guy told me one time there is no way you can pour a 1\64 round head with a barb on a #2 hook....I have sent him several 1000 sent then...lol....IT CAN BE DONE....you just got to get your mind right like Cool Hand Luke....lmao...