These hat stretching discussions are great. I've stretched numerous hats using both a Hat Jack and a vintage hat stretcher (my actual hat size is just under a 7 1/2). However, I have encountered a problem, particularly in using the hat jack, where after the stretch the bottom of the crown sticks out further than the rest of the crown. Has anyone else encountered this problem. The answer is obviously to stretch the entire felt of the crown, but is there a danger in tearing it? Also, does anyone have any particular thoughts on stretching a stiff WOOL felt hat? Thanks for your thoughts on this.