several people I know swear by the Turbine. it's a crank device that you use to give more leverage when you're placing an ice screw. my old ice partner, Yuki Fujita, thinks it's wonderful. he got one a few years ago & uses it all the time. recently I've been hanging with Mark Synnott & he uses one as well. he says it really helps on very steep climbs when the act of turning the screw into the ice can be really exhausting. he also says that the CM screws work especially well with it, but I've never seen them available. the cost is only $20 & I've been thinking a lot about getting one.