Stock shifter is threaded on so it screws on tight. With set screws the knob just slides down the shaft (this sounds erotic) and the set screws are tightened to hold the knob in place. There are three set screws with this shift knob and I have had zero issues. To some this is a pain because you need to keep an allen key with the car if you ever have to remove the shift knob.
Ah my question is answered