OK late to this post and pardon my ignorance. Have both a Tony Hayward and an Arc electric start kit ready to fit to my Tbolt. The Tony Hayward belt drive kit came without a clutch centre and cush drive and ran on the BSA 3 spring clutch. The Arc electric start comes with a modified clutch centre running on a sealed bearing as runs dry. The clutch cush drive is a clone of the BSA / Triumph cush drive so why would this be inferior/inadequate?