I put this together last week.
I have yet to deploy it.
The red and black push button switch was defective so was bypassed.
The toggle switch was to, "arm (and disarm)," the push button momentary switch to send the current.
All in the interest of stability, in experiment setup.
It can be done with just the toggle alone.
I put it together as much for a possible encouragement to/for others so inclined as to use it in a careful manner myself to the end that any possible results could be easily replicated by others.
It is unlikely that I'll be able to devote the time to a good run at it anytime soon.