If your one of us who finds your fingers twitching when climbing with a leash, sounds like you need a trigger. Two sizes to match any grivel tool, i put mine on my rambo evo 2's. I have large hands and never expierenced any stress on my finger while swinging into new ice. while the tool is turned around the trigger can get in the way of swinging the hammer or adze. kinda sucks but a sacrifice im willing to make.