These answers are exactly correct. When my HQ18 Avante arrived and the guy put it together, he had me come stand near it and put my hands on the machine. He asked if that was comfortable and if I wanted it higher or lower. The proper height is one that is not straining to YOU. I find that I end up feeling back pain after pinning (so considering a zipper or red snappers), but running the machine it's the perfect height. Adjust it with you standing as if you would be running the machine.