Quote:
Originally Posted by The Professor
So the piece that starts about 1/2" from the front end and continues back (once solid piece) into the wall *is* the nut? 
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Exactly. And it's not going to come off easy. If you are not grabbing anything - then you are not using a large enough socket for it. That looks to be either a Sterling or Eljer faucet. The chrome part on the stem tighten against a packing - but you need to loosen the part that looks like the body to you - and it's all the way in the back. You may not have enough tile removed.
So you need a larger size socket (plumbers) and a large wrench in order to turn the socket. Once that is off you can replace the washer and the seat. Be advised the seat also takes a special tool (cheap) - insert it and then tap it lightly to set it, otherwise you will just round the seat off. If you can't get it out then you could install a beveled washer, but it won't last as long as the correct one. And don't forget the grease.
Ron