Borrowed, could you put up a photo of your modded spear? I have an Assegai and I'd like to modify mine as well. I also have the long shaft version and I was a bit disappointed in it. My son and I were throwing it at a plywood target and one of my son's throws [always blame someone else if you possibly can] just barely penetrated the plywood , leaving about a quarter of an inch of the tip supporting the whole weight of the spear which resulted in a bent tip. Maybe that's to be expected.
One day I think I'll pick up the Boar spear as well.
By the way, does anybody know where the program "Deadliest Warrior" gets their spears from? They look pretty good and I don't think they're from Cold Steel.