The Double Locking Collar firmly secures the Index Drive Center to the Headstock Spindle shaft during heavy milling.

Even though it comes as standard equipment on Legacy's larger mills (Models 1800, 2000 and 2200) it is now made available to those with smaller units that find a need for it.

One of the advantages of the Double Locking Collar that applies to all operators, however, is that by loosening one of the set screws the workpiece can be easily rotated into the correct milling position.