Hi Doc, as I said earlier I will do this mod, but not until they reopen the airports here...when I do the mod I'll likely just cut the grey wire and put a switch in there that will be accessible thru the side of the track...I've got loads of the small switches that came out of my Carrera cars that were used to switch polarityAnyone else given this a try? all feedback welcome! for example... was it easy or difficult? and... did it work...? ie were the results positive? or... was it truly awful?