I've used all of the fiber gears sold by Brattons and Snyders . Some failed sooner than later. I explained to one of the guys at Snyders the trouble that I was having with the fiber gears , back in the 1990s ... I told them that I needed a stronger gear, They sent me a Dan McEachern bronze gear with his name on it and that solved my timing gear problems . As for stronger gears, I've never had a metal gear fail. Metal gears do cost more and are worth every cent to me. If a person insists on using the cheaper , weaker fiber gears, any of the venders will gladly sell them one.