Originally Posted by winmutt

I stick a 17mm or so wrench head between the cam tower and the spring nut to keep it from turning. It is very possible to turn the nut off the valve you will then be taking the cam off to fix. You shouldnt have to turn it more than a 1/2- full turn usually. You really dont need the Hazet, you do need to bend one of the 14mm and then make the head thinner.