Lifters not moving freely

I may be able to hit up Harbor Freight and grab one if the 3 pronged one wont work. Why is one better than the other? I suppose I didnt consider that the block may be tougher than the honing stones but wouldnt have been confident enough to just dive in without being sure either.

The stone type removes a lot of material. The little dingleberry type does not. Easier to control how much you remove.