Rowuk I agree with all of the above with one reservation if the brass is showing and uncomfortable, and the teacher agrees then a mouthpiece change is not a bad thing. I also think that the the OP is not one of the typical SAKs we get on here every year and can be treated a little differently. Much as I respect you, that embouchure needs looking at very carefully and maybe, maybe with the right input, adjustments need making and without being in the same room as the OP neither you nor I nor any one of the best teachers around could make the moves without risking harm. Strad I can see where you are coming from but I have two comments to make your ideal of a totally centred placement can't work in all cases because we are not symetrical creatures. When I start a new pupil off (if they haven't been screwed up by very poor peripatetic teaching in this country) I get them to blow out the candle and in most cases allow them to centre the mouthpiece over that area and form the embouchure centred on that spot. Then take into account breathing and relaxation and everthing that Rowuk discusses. I also think that what you see as people answering each other comes form concern for a players well being rather than as you seem to suggest some testosterone fuelled contest over who is right. Your comments are obviously aimed at myself and Trickg but I assure you we both have the OP's best interests at heart even if we disagree over the path there.