I found this old (about 50 years old) Mercury Electric motor speed control. Not that it contains any mercury, the name of the company is Mercury Electric, and they made pretty good resistor based step style motor speed controls, and this one is the much coveted combo foot and knee control.
It was cheap because all the external wires were rotted off.
But when I took it apart the rest of it was fresh new looking and un-corroded. So I re-wired it my way, using recycled computer connection cables suited to the current.
It connects to the junction box which also has the line (recycled from a computer monitor) power cord.
The junction box is a new grey plastic affair from Home Depot with new cable connectors for a dust free connection. The stainless steel top is new as well.
Total cost about twenty bucks for all the hardware.
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