I would try using the press before I took any orders. Or at least have a backup plan like going to the shop down the street if the old press doesn't work, and know the cost beforehand so you don't lose money on the deal if that happens.
Practice on old shirts with the actual vinyl you plan to use... see if you can get the settings right before you use the final garments.
My old hat press must be at least 20 years old. That too had stood for a number of years, but it still works fine. Most of these presses are only glorified hotplates. I speak as a fully qualified electrical engineer when I say that. There really isn't that much to them.
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