As a person with a degree in electronics, I would like to say that darrenbb hit the nail on the head with his answer - a potentiometer in series with the motor. A small 1K (or something close to that resistance) should work fine. Most of the pager motors that I'm familiar with usually use AA 1.5 volt batteries. But, with the added resistance of the potentiometer, you can probably get away with using two batteries in series, which would double the voltage to 3 volts. Putting them in parallel will keep the voltage constant (1.5 volts), but would make the batteries last longer by splitting the current load between the two batteries. Hope this helps you out. Let me know if you need any other electronics advice. 8-))