I used to be a foreign car mechanic, so I have a wide variety of tools. However. I have found that using one of my three my drill presses to feed a thread tap assures me of it being straight. Probably not news to anyone, but thought I would offer it anyway! By the way, I have four cabinet saws, eight routers, four bandsaws, two wood lathes, and I usually keep them set up for different operations. Just bragging, I guess!