I'm having an "OLD TIMERS" moment! I am trying to place and LOCK the Thule kayak rack on the top of my pickup shell. The locks were replaced a couple years ago when I changed vehicles so I am assuming they are okay. I have both of the racks seated now securely but can not lock them down. I'm heading 1800 miles west next week and want them locked for safety reasons. Do I need to push in when I turn the key? (My dealer is no longer in business so they wouldn't be a help). I know I'm not doing something simple!