James, either something is wrong with tour car, or you aren't understanding the process. These knobs can be quite stiff to pull out, and that might take two hands. But once you get them pulled out a few CMs, you should then be able to rotate them 1/4 turn where they lock in place, in the pulled-put position. If you can't pull them out, then maybe they are just frozen and you need some help or even fashion something as a lever to get better lift. If you c an pull them out, but they won't rotate, then maybe they aren't pulled out quite far enough. Also, have you tried both? There is one on the right side, too.