If you have some scrap aluminum plate 3/8 or thicker laying around, two pieces about three by four inch with four holes drilled in them in about a 2x3 pattern will work. clamp the plates around the T bar so the long side is the place to hit, torque with an air wrench till the plates bend, hit with a BFH. No need for anything but removing the retaining ring. It might slide a bit on the T bar, so retorquing might be needed. this works on about any stuck T bar. The plates will twist on the T bar, but it helps them bite more.