You don't really need a reversing switch if you are willing to pick the drum up about once a minute and set it back down in the reverse direction. This is what i do and i have no problems with uneven development. Seems easier than rewiring. Of course you do have to keep am eye on the clock and flip the drum. But you need to watch the drum anyway when on a Inicolr base. mine tends to creep to one side and tumble off the base if i don't keep an eagle eye on it.