How to use the Kadee Gripper to work on model train cars By Jenny Freeland | November 20, 2011 | Last updated on November 7, 2022 Email Newsletter Get the newest photos, videos, stories, and more from Trains.com brands. Sign-up for email today! Get Updates Having trouble viewing this video? Please visit our Video FAQ page Model Railroader associate editor Cody Grivno shows how to use the Kadee five-prong gripper to test screws on your freight cars.