I'm a little late posting this, but I had a very good experience buying a UUC 8.5lb flywheel from Yanatron a couple weeks back. Was packed well and came to my door in only a couple days. Yanatron was honest with his description of the items and their condition, and was even extremely helpful when I asked for pictures of specific areas of the flywheel.
to Yanatron! Best of luck to you selling the other parts!