Hi Scott
I'm not sure what he used to produce the static charge. Sounds like he used one of the commercially available hand held units you use for "normal" static grass application, dismantled it and used it with relevant leads connected to the tray.
That's my "guessimate" of what he described, I could be wrong. Having said that aren't the units quite expensive to buy, so ripping one apart sounds like a job not for the faint hearted, or if safety is a worry if it's mains connected
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240 volts in the UK is a potential killer !!
Alan