Answer :
Final answer:
A steady rest can be set up when the shaft has no center by using a lathe with a steady rest attachment.
Explanation:
A steady rest is a device used in a lathe to support long workpieces that are prone to bending or vibrating during machining. It consists of three jaws that can be adjusted to securely hold the workpiece in place. When the shaft has no center, a steady rest can be set up by using a lathe with a steady rest attachment (C).