I have had the threaded portion of the cover plate break twice now and all the bolts back out of the other 2 . I use lockite 242 on all of them and they still break/ back out . I have the 3 bolt roto start but also see there is a 4 bolt roto start with the center drive and no one way bearing for the f4.6 which I have . Is the 4 bolt / no owb design better to use U couldn't really find any input on it .