Grizzly T24342 - Spindle Lock for G0463 and G0619
With the Spindle-Lock, you simply bolt the Spindle-Lock onto the head of your mill and within minutes, you have an easy-to-use way of "locking" your spindle for tool changes.
Just press the big button in front and the plunger locks into the groove of the spline. When your tool change is complete, simply release the button and the plunger springs away from the spline to avoid nasty disasters (of course, you still have to remember to remove your drawbar wrench!).
Speaking of the drawbar wrench, you can slide it into place on top of the Spindle-Lock. Now you'll always know where your drawbar wrench is. The slot prevents your wrench from jumping out of the Spindle-Lock. Ingenious!