Yeahh that’s exactly what happened. A classic 10 minute job turned into 3 hours. Grinder came out the vaping kid is bruised upIf you find that the knob is twisting but not undoing the threads are probably all messed up. Happened to me when I first took off the knob on my CE and an angle grinder was required. Good enough reason to move over to a cheap short shifter and throw what's currently in your hand at a vaping kid or something