When you say spindle, what exactly do you mean? Main spindle for the machine? The one that holds collets that hold cutters? If so, that is gonna be a tough one. Famco bought Gorton, and many parts and accessories are still available, at very high prices.
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But these machines are considered obsolete by industry- cnc has replaced them, so parts are hard to find. I was lucky enough to pick up a lot of tooling and type with mine, boeing surplus via halladie machinery- wouldnt have bought it otherwise. But no spare main spindles.