I used this to install my circlips (piston wrist pin retaining clips) on my Fatboy during a 95 ci upgrade. I tried it by hand with pliers and a screw driver and it felt like I was going to break them and I sent them flying across the garage several times.
This tool works great. It is even better once you have the first one in to hold the wrist pin in place while you install the final clip to mount the piston. It took 3-5 minutes to go from pistons out of the motorcye to both pistons mounted using this tool.
I hate the price, but the frustration it removes is worth it.