Since it's a manual Carefree I'm assuming the end that moves is also the end end for the lock? My guess is the lock mechanism has a worn or broken tooth. The whole mechanism is encased and part of the spring endcap. To replace the mechanism you need to replace the spring. If you're handy, springs are available on Amazon for just over $100. Measure the length of the awning tube because they sell the springs by awning length, not by awning model number.
- Start at the Carefree of Colorado website Link
- On the webpage page click on Motorhome
- Click on patio awning
- Click on Fiesta (Doesn't matter if you have a Fiesta, SpiritFX or Simplicity) the manual and parts are the same with differences spelled out in the guide
- Click on Patio Awning Service Manual to open the pdf
The part numbers are in the PDF on page 20 and Item number 20. You can type that part number into Amazon and order and replace the spring and end cap. On the part number replace the XXX with the code for the color of the cap. -55 White -06 Black