I had similar issues when replacing mine. Not sure what I actually did, but remember when I first installed the new one, it was doing as you described. Took it off and looked at it and it seemed it should work, but it still was not cooperating. If memory is correct, I had to use a small screwdriver to position the mechanism inside the shifter handle so it would fit on the metal shifter and align with the small pin that the button pushes down. And yes, lube the shifter.