Unfortunately lip plates do bend quite easily on many flutes of all levels. Many of the plate radii are altered just from player's assembling the flute by holding the lip plate improperly. I don't mind grabbing the lip plate in a really stuck issue like this as long as it's checked and restored to it's original radius.Gordon (NZ) said:Hundreds of times, I have grabbed a flute VERY tightly, around the embouchure plate (for more torque) when I am using the specialised tools for shrinking tenon joints. On some flutes, especially student ones, the tubing is very strong, and enormous twisting force is needed - much greater than that needed to remove a stuck head.
As I indicated, peeling the leather off the palm of my hand is a significant risk with the combination of forces involved, and the sharpish edge of the plate. For some flutes, there is no way, even with my strong hands, that I could get sufficient torque by holding only around the tube. The only way to hold it to get really high torque, is to use the bony part below the base of the fingers to push on the edge of the lip plate, in an action around the flute.
Because this is around the flute, there is almost no bending force on the lip plate. The only lip plate that could bend would be one that is of extremely soft metal, and I have encountered this only on the very cheapest and nastiest of flutes - flutes of a quality that you probably have very little to do with.