Thanks guys.
I was more concerned about the nature of the sharp lip of the edge, I can crimp them matched but due to the shape of the hold I cannot crimp fully and have to keep fingers flat. There is alot of stress on what feel like my bone between first and second joint.
I would rather drag, but not on the sharp edges, this is training after all not injuring.
I think i will modify it, just wondering if anyone had experince of reshaping plastic. I suppose if i cock it up i will have to bite the bullet and get a beastmaker.