I've been using a foot pedal from an old sewing machine that my grandpa gave me for 15 years. it's great. check goodwill or salvation army store or maybe a sewing machine repair shop.
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Google rheostat it's a sort of variable resistor. You can get one cheap at W-mart they are used for dimming lights. Cut your power cable and wire it up to one of the 2 wires..(dosn't matter which one) . Put the other wire back together like nothing happened. use electrical tape before plugging in. Wire caps are a good idea too. Don't shock yourself.!!!