I just installed a new sink and my wife wanted a new drainer basket, old one was a little scratched up. I purchased one that was compatible with my disposal. But I am having a leak at the mounting gasket. I can't seem to get the lower mounting ring any tighter. My wife wanted to know why I was using a hammer to do plumbing. I told her I was doing well I only have made two trips to Home Depot, my usual is four for any project. No leaking at the sink flange and sink but between the sink flange and the mounting gasket (rubber seal that goes over the top of the actual disposal.

Anyone know what else to try, or should I order another mounting gasket.

Thanks