Someone trained you? I thought you learned how to break stuff on your own.
And you've been looking because you can't figure out how to get the damn things apart either which is a problem given by your own admission it's all you install.
Which I suppose was your attempt at sarcasm. You then went on to bitch and whine that they didn't hire a locksmith, which I suppose I should agree with since theoretically I stand to benefit financially but being that I do all my own home repairs plumbing electrical etc I take issure with none the less. Not to mention that exchange of information for anybody who wants it is more or less why this forum exists. Now you come back sweet as candy suggesting that the seller might be able to help.
I think you have a split personality. I would assume you were being forged except you never post to complain that that's the case so after numerous instances I ruled it out. That said both general methods to get the cylinder out from the back have been posted several times. So you should know how by now and so should the OP..