This is the 1st time I have seen these expanders for the oil control rings. One member said he left them out but there has to be a reason they are there. I am going to call Riken in the morning but thought one of you guys might know what the skinny is. Just in case there is some confusion.....its the spring that they give you to put under the bottom ring. I guess its pushes out on the ring?????? Can it be left out?