I am having a similar problem. It seems to work fine for the 2-3 point, but not the 1-4. I replaced both points because the 1-4 seemed pitted, but am having the same problem.
When I turn the plate until the light comes on, I have to turn it quite a bit for the light to go off again. Then I have to turn it a lot for the light to come on. I can't seem to find the exact spot where the light will go on or off with a tiny adjustment. Again, this is just the 1-4. I tried the best I could to get the same gaps on both.
Thanks for any help
Chris