Okay, so zucchini’s the key. When you say 1/2” diameter, do you mean you cut the zucchini into lengthwise sticks about 1/2” dia. to feed into the device?
Nooooo! Trim the stem end off the zucchini, then twist it into the Veghetti, turning as you go. Noodles will emerge through the cutter slots. Stick a fork into the end & rotate it to get as much noodles as possible. You’ll be left with a cone-shaped piece when you’re done.
Now....if you cut zucchini into quarter slices, dust with Parmesan & then bake, that makes for a great white substitute. We make that more often than veghetti. Enjoy!