I turn a number of rolling pins, and haven't found a steady rest to be
needed. For larger hollow forms yes. For long thin spindles, yes. Rule
of thumb for spindles, is 10 to 1. A spindle 10 inches long by 1 inch
thick will have little or no vibration as it is turned because there is
enough mass to support the wood. . Going longer there will be some
vibration depending on thinness and pressure.
robo hippy