After I took mine apart, I found that neither the new nor the old ring would seal it well enough. I had a sheet of composite gasket material laying around that I cut into the same shape and size of the rubber gasket that comes with the lock ring. I put the "spacer" I made in between the rubber gasket and the new lock ring and it hasn't leaked yet. Just put plenty of vaseline on both gaskets so you don't tear them up if you have to take it apart again.
