After removing the old shower stall I have noticed that the drain pipe coming out of the floor is crooked, by quite a bit. When I set the new shower pan over the drain pipe it is so crooked that there will be no way I can get the drain gasket pushed over the drain pipe. Will I have to have the floor torn apart and have the drain pipe re-done or can I create some kind of gasket around the crooked drain pipe with some kind of sealer rather than using the drain gasket that came with my shower pan. Apparently that was how the old shower drain was sealed in the old stall, which ended up leaking because there wasn't enough support under it. See attached pics. The drain pipe will be shortened to fit about half-way down the drain opening in the shower pan in the attached picture.
Thanks for your help,