It might be hard to understand without looking at them but here I go.......
The old ones are longer and have a cone shape going from the main outer piece up to the chisel point. That cone shape is hollow so we could make weight. When the head hits something VERY hard, it opens like normal but with the force going forward from the speed and weight of the arrow, and the sudden stop of hitting something very hard, it causes the cone shape of the outer piece to jump the set screw or alignment screw and the cone then is forced over the inner piece that is sqaured off at the top. Cone over square tends to add a LOT of force to the back end of the outer piece or shroud. The shroud has small links holding it together in the back that are the triggers for the blades to open. They are located at the bottom of the blade slots. When that great force pushes back and outward because of the cone shape, the shroud breaks at the thin triggers.
We shortened the head to keep within the weights. We had to add some solid metal shelfs to the front instead of cone. Now when the head comes back to open the blades, the outer piece has a flat solid part that smacks the flat solid inner part and it is solid against solid now. They are litterally MANY times stronger.
I need to add that if the older ones break they break after the head is opened. They should still do thier job unless a bad hit is made and then you can't ask any broadhead to do the job when you don't. They definatlely don't always break. In fact it is very seldom if you hit animals where you are supposed to and don't hit rocks and such. I would trust them for any of my hunts. They are doing "fire sales" at epekhunting.com to sell the many packs of old ones. They are very deadly but sometimes are not able to use them again. That doesn't bother me too much as I don't like to use mechanicals again too much anyway.
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