It is the EGW knob. Saved me about $7 over the badger. I still may switch over to the grooved one they make I couldn't decide.
I used my straight die grinder with a cut off wheel to cut it. I used my 90 deg. die grinder with a 36 grit disk on it to round it. You could use a file if you don't have a die grinder. Just take your time and take a little off at a time and keep measuring till you get it where you want it. If you are really like the sound of a bench grinder, you could just grind it down from the get go and not cut it square like I did. It would just take a while and you would have to keep breaking so it didn't get too hot.
So far I like it a lot better than the factory knob but I have not shot it yet (damn mother nature). I was out a couple of weeks ago and shot three hundred rounds out of it. The factory knob made my thumb and fore finger raw from the knurling on it. I don't think I will have that problem with this one.