Larry Jaques wrote:

How is the CNC drawbar engaged? (curious) I thought drawbars were
just glorified, dual-threaded long bolts which engaged the bit from
the top, drawing it into the tapered spindle hole.

Old style power drawbars on CNC or even manual mills just drive a
regular threaded drawbar with an impact wrench. Modern CNC drawbars have
a collet on the end that grabs a pull stud on the tool holder, and the
retaining force is provided by a stack of belville spring washers. The
release force is provided by a hydraulic cylinder.