I have a new soft top for my Mk 2 Sprite but it is too tight to be able to hook onto the rear mounts when it is fitted to the windshield. It has been sitting in the warm sun for an hour but I still can't pull it enough to get it mounted. Are there any tricks to get it to stretch a little more? It seems to be about a half inch shy of being able to hook under the rear mounts. Would it be better to attach the rear first and try to get the bar into the windshield groove with the rear attached?