Something I've learned in present and past jobs, serving as a de facto millwright in R&D and small factories: If someone is offering something on the used marke

Something I've learned in present and past jobs, serving as a de facto millwright in R&D and small factories: If someone is offering something on the used market, it's because it really exists, and they want to get rid of it quickly. Next day shipping on some giant machine? No problem. Some things, it's dumb to buy them new, like optics benches and some equipment that's expensive to make but easy to qualify and calibrate. In contrast, even "catalog" items from mainstream suppliers might have long waiting times if the supplier is a build-to-order outfit.