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Web instead of using a motor that pushes the needle down, pneumatic tattoo machines have a small air compressor. When you press the pedal,. Web the pedal serves as a switch for your power supply and is directly connected to it. Many photos of tattoo machines with designer. Web you can even check out the instagram profiles of different tattoo artists. So, for the rotary pen tattoo machine troubleshooting, you need to check the power supply, clip cord,.