My US40+ is still in the box I am embarrased to say. Had an accident with my Extra 300 and because of limited space wanted to get it repaired before starting a new project. Bad time of year two. I have already gotten the DB retracts and they look real good. They too have the 3/16th strut but no axel. Have never tried the Robart stuff. Might be a good deal especially at the price you are talking about.