I have done or tried just about every mod possible on a Radrunner 1, and love what I have as a result. However, I see the new RadRunner Plus now has gear shifting ability. At first I thought that was a bit superfluous, but am beginning to "get it" and want to try getting there. I have seen a lot of discussion about the idea, but nothing in the way of a successful transformation. Has any one tried? Are there any "bolt on" kits out there" How about after market generic kits that may work? I'm willing to invest the money and time to try, but need a place to start??