I've been looking for a replacement crank bolt wrench and can't seem to find it. It is a 16mm bolt and supposedly a standard socket won't fit inside the crank arm hole and only this tool will work. This was a particular problem with the Zeus cranks, and I recall the shop guy saying I'd need to buy it since the bolts need to be tightened from time to time. I've had it ever since, almost 25 years, and yes I've used it over the years, but I never even tried a socket wrench. Of course my socket set goes from 15 to 17, no 16. Maybe a trip to Lowes or HD is in the works for the parts to Sheldon's remover, and a 16mm socket.