I like to turn hollow forms. While the normal set of hollowing tools work for smaller forms, I like to use a set with an arm brace for larger ones. In fact, if I can work through a hole of 3/4" or more, I would just as soon use an arm brace for smaller pieces as well. An arm brace gives a nice control over the torque of a side cut on a hollow form. Incidentally, Solomon was right as usual, there is nothing new under the sun. After I had come up with this idea, I saw a virtually identical arm brace in a GMC publication on tips for wood turners.