I just got a 3/8in mill holder with a MT2 taper. I used it once, and then changed the mill inside. As I was lightly tightening it, the setscrew cracked in half! Now my exspensive bit is stuck in there and the mill holder is screwed. I got this from harbor freight. I hope they will send me another one 2nd air, with either my mill tool or a new one they stock that is similiar. GOD!! I am soo madd... I have waited two weeks for my mill to get up only for this to happen!