Motor Bummer

Well I bought 2 E100 Razor scooter motors from an on-line store. They only sent me one and refunded my for the second sighting 'out of stock for months.' This really bummed me out. I now have to go and buy another 2 motors so they match up. As David L. put it on astromech.net, "I have found that there are several manufacturers for those and you may have some problems getting your droid to run straight using two different motors as one may have a different RPM depending on who made it. All it takes to change the RPM is to add more or reduce the number of windings for the motor. There is no guarantee that the different manufacturers will all use the exact same number of windings."