I have a question about the billetflow pulleys. Is the non slip pulley better than the regular pulley. I know its not going to slip as much but im wondering if it having the groves will shread belts easier. My friend had one with the groves it wasnt billetflow, but he keep shreading belts with it and he told me to get one with no groves. So if you have a non slip pulley please let me know how its doing. Thanks