Question
what do you think of me using just ringer lawn restorer and lime as  my only
source for lawn fertilizer

Answer
I haven't used the Ringer brand before, but I like what I've read and heard. It's a well balanced fertilizer that will give your lawn all the necessary nutrients. It is also a good organic source.

As far as fertilizer goes, I have no real problem with your plan.

-C.J. Brown
www.TheLawnCoach.com