I just picked up a sharpener and all I can is, IT WORKS!!!!!!
It's called, 3 rivers 3 blade "CC" B/H and knife sharpener. ($26.50)
I took out a 150 gr Magnus Stinger 4 blade and a 150 gr WOODSMAN. Both broadheads passed thru deer. One bounced of a tree and the other bounced along the ground. After 10 light strokes both b/h's were sharp enough to go hunting. I was really surprised that it didn't take but a few strokes and just a few minutes to get a sharp edge on both. Didn't try them on any other b/h.