Just did that I don't have impact so i recommend my way.. First i warmed the bottom bolt with (60-80W) soldering iron for about 20 minutes till all gets warm enough to loosen the loctite. For the other end I got a M16 Nut and glued it to a 10mm socket (you can weld to 2 together), i used 3M Epoxy. Than I recommend holding the bottom bolt with an Allen key and opening from the top with the wrench. Good luck.. Actually I was surprised how easy It was this way.