"Kodak" Ektagraphic slide viewer

Does any one had the chance to operate one? That cassette part doesn't looks to relaible.
https://www.recycledgoods.com/kodak...ektagraphic-260-audio-viewer-slide-projector/

I don't know about the model you've shown, but Ektagraphics are the standard of the universe. Slides are fed by gravity, not forced in. They are by far easier on slides than projectors that force slides from the tray into the projector gate. 80 slide trays are trouble free, 140 slide trays can be difficult. I have an Elmo Ektagraphic/Carousel clone, have used Ektagraphics and Carousels for decades. Note that Carousel is a Kodak trade mark, is not a generic term for circular slide tray. Ektagraphics are essentially professional grade Carousel projectors.