Oh
Run a big ass bolt into one of the holes in the flywheel face, put a piece of 2x4 or similar across the case and use a pry bar on the bolt. Couple gentle taps on the flywheel and she should pop right off. or put the nut on so she is just above the threads and you can pry some that way, too.
If it were me, and I just had it done a few months ago, I'd take it back and have him redo it, shouldn't be fubar by now and should be under warr.
A