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What's holding the spring in place? The taper on the top of the CNC probe cover? I'm not from the states, so I can't use McMaster-Carr easily to get exactly the same parts you used.

Also, what is the washer for? I don't see it anywhere.

For those trying to find a spring, it has to be at least 18.58mm tall, have a small diameter be less than 9.5mm and a large diameter less than 22.18mm. The distance from the end of the collet/chuck to the bottom of the printed part is 43mm.