I'm talking about the front rand rear edges of the slider, sorry for the arrow placement, kind of in a hurry when I did it. I taper the back about 30 degrees, but only from the middle of the edge up to the top of the edge, not a whole bunch, but just enough to make a smooth transition. I don't have any pic's of one done at the moment, I have the guy that does my axles harden them for me, I'm not 100% sure which method he uses.