Thanks H. I did some additional digging and found the following for someone else that may search the forum this information. I figure if I pin the left side (facing the trailer) of the torsion springs, I won't have to worry about rewinding it.
the bead in the canvas usually wraps the end the end of the roller tube to prevent the canvas from sliding in the tube. thats hard to cut, to remove the canvas, with the end cap on. 9 winds rolled up and 15 extended for an 18 footer. heres a link to my method of replacement. and a dometic link as well. winds are found on page 19 of 29.