You might use the same setup at a later date on a job that requires total accuracy while forgetting you did a poor setup job, and the part will be ruined. Mount the holder to the rotary table with the hold-down screws tightened just enough so the holder can still be moved with a light tap from a plastic mallet. Now use a dial indicator to bring the holder to its final position by reading the runout error as the table is rotated. After all runout is eliminated, give the hold-down screws a final tightening. The included bushing is used in the center hole of the rotary table to locate the collet fixture within a few thousandths of an inch of center.
Final adjustment is done using a dial indicator to eliminate any runout that remains.
The holder can also be mounted to any milling table. When the holder is mounted to a Sherline mill, the base of the holder should be mounted with one mounting screw in each T-slot. This allows long parts to extend past the bottom of the collet fixture. If you need even more clearance, the hole in the center of the Sherline rotary table can be drilled all the way through the table to hold longer parts if needed. It will also retain the use of the centering bushing to align the collet fixture.