If you don't want to replace the tail you can get by using a drop or two of super glue on the tube before you slide the tail on. Make sure you get it verticle and the belt tension set quick before it sets up. When you need to remove it, use a heat gun on it but not too much and twist. I had the same problem with the boom coming out of the forward plastic holder on my 600 no matter how hard I tightened the 3 bolts when doing fast piros. On a 600 with a torque tube that is not a good thing as the torque rod becomes disengaged, unlike a belt which would tighten as the tube slips out. Yep that made for an exciting piro crash landing.