He used a toggle that ordered from England (he is in Australia). He said they were toggles used by researchers for a similar purpose. He gave the company, and I tried to get some but they had already stopped making them or I couldn't find the right company.
Anyway, you might experiment with...
It works very well according to some who use it. This guy gives an update a year later in a different video.
https://www.bing.com/videos/search?q=world's+most+incredible+chicken+feeder+glow+in+the+dark&&view=detail&mid=D08035B0A6BA36AD8FEDD08035B0A6BA36AD8FED&&FORM=VRDGAR
Opps. That is the...