I had to adjust mine. There was NO WAY it was going to stretch on. At the time I had the fan assembly out so I had enough room to put a notch into it with a Dremel. If I was to do it again I would find a nut that fit, smear the threads of the nut with JB Weld, thread it on and wait for it to dry. I think this would be even easier to adjust from the top than notched.