We added a VFD to ours, built a sub-frame to hold it under the chip tray, attaches with existing bolts.
Control in same spot, ours has home made chuck key holder there.
We added a foot bar that is also stop.
Start with drum switch, vfd is soft start.
Can stop with foot or drum.
Below the light switch is 20 Amp rated DPSP used for main disconnect, pot is speed control and meter can indicate general speed or load, it is connected to a signal line from vfd.
On the drum switch we modified so it controls the vfd.
Added a 240 vac neon pilot to indicate power present.
Helps at night to see it was left on.
Photo from when we put it back together, it is ob our car lift bench.
Later used fork lift to place it.
Working on it here was great as we could stand up to do everything.
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