I added a comment to that thread (never seen it before) about the locking holes on the end of Carefree topper roller tubes for future reference by others. Here's the info...
I have replaced my topper material twice on both slides. The Carefree roller tubes have a set of locking holes toward the left end of the roller tube.
After opening the slide, I unroll a bit more fabric by hand while looking for one of the two holes on the face of the roller tube near the left end of the tube. I "lock" the roller by putting a pin or screw through one of the holes, then rotating the tube by hand until it drops through the hole in the inner piece. That locks the roller spring in place. Then I remove the bolt through the end of the roller and lift the roller just enough to slide the fabric out of the slot.
The screwdriver through the end will work well, but has to be left there until you put it back together. If you pin the tube via the holes, you can remove the tube or whatever you want/need to do. In the case of my toppers, there is more than just a few inches of fabric left on the roller tubes when the slides are all the way out. Unwinding the spring-loaded roller tube by hand that much would be difficult.
Paul (KE5LXU) ...was fulltimin', now parttimin'
'03 Winnebago UA 40e / '05 Honda Odyssey toad