is there a trick to mounting the louvers-the assembly manual shows 3/8 diameter holes used for mounting my question--is there a trick to getting the rubber nuts behind the fender--the front two louvers can possibly be held in place using the adjacent louver holes but how do you attach the last two louvers? i have the correct hardware for attaching the louvers but there must be a way other than force the rubber nuts through the 3/8 holes while attached to the louvers.