Cast iron sink drain leak
 

Just installed a new cast iron sink, I installed the drain baskets and they leak. I used lots of plumbers putty and they still leak. When tightened as tight as I can get the drain basket from underneath there is still a gap on one part of the drain basket. It's like the drain hole is warped or not even creating a nightmare for me. What can I do to stop the leak?

post a picture.