Im not knocking Tiger X Products Because i've owned quite a few Tiger X shafts and Just Got another. Never had any problems with brass inserts. But first experience i had was i sent a radial shaft off to have a tiger phenolic insert put in when i got it back it would only screw down 3/4 way. I used a white grease to lubricate threads tried again still wouldnt, backed off tightened tighter with almost all my strength started going down and crack split the shaft. Well i order a tiger x shaft the other day with 3/8x10 for my other cue. got it out screwed it down well what do you know about 2/3 way down wont go. So from experience i just used little wd 40 tightened down backed off about 20 times till i had blisters and some of the threads from inserts shaved out some doesnt look good but the shaft screws down like it should now. And im ordering a radial tiger x for a friend of mine next week and im concerned about it. Is this just my luck or an issue with the phenolic inserts.