Momo...it includes different sized rubber inserts for the knob so it doesn't screw on like the stock one. You just use the appropriate insert to ensure a snug fit, then tighten the three screws on the knob itself.
CelicaHobby.com is an independent Toyota Celica enthusiast website. CelicaHobby.com is not sponsored by or affiliated with Toyota Motor Sales, USA, Inc. in any way. The Toyota and Celica names and logos are trademarks owned by Toyota Motor Sales, USA, Inc.