Re: Nirve Cannibal 3 speed hub - Shift kit?
Yes, you'll have to have the center hole cut out as large as possible! :/
Another method, (if you have access to a welder) is to weld two brake arms together with a 1/2" piece of pipe between them to get the arm to stick out of the sprocket hole further. (it's a little hard to explain without a picture).