Note that these two pictures show completed machines, as available from Orgasmalley. XLR connectors are three conductor plugs and jacks used in professional grade microphone and similar audio equipment. The Powerline connects wall power to the motor, providing a way to operate it and control its speed. Power cord is high quality 10 foot cord with connectors stripped and tinned, blade terminals on hot and neutral, ground with ring terminal. In the torque range on a sex machine, we don't need to employ a key.
It is really a plug and play device:
Home Made Fuck Machine: Better than an iPhone
This 12mm mount offset pin arm is specifically for the Chinese new motor listed above and the Probe machine from Orgasm Alley also sold elsewhere as the Plow. Select the 16" long slide for applications up to 8" maximum stroke length. This is an extra-heavy duty, three part ball bearing drawer slide, 14" or 16" long. If you're overseas in a country with VAC power grid, you can either build a VAC machine and employ a voltage converter, or you need a motor rated for VDC. How good is it? The major American brands in sub-fractional gearmotors are Bodine, Baldor, and Leeson. A general assessment of motor power is horsepowerofficially