dry cell might work if it's good enough, I use a battery charger that does 6 or 12 to power things, if you don't have one that does 6v, just try it on 12 .... adding another layer to go bad seems pointless to me, and there's 12V motors readily available to match the physical specs of the 6V one [size, speed, rotation direction, shaft], that won't cost much more than a reducer, maybe less even - the reducer is a heat generating device, just like the multispeed switch, why put another thing to burn out or start a fire under the dash?
Bill
