I have had the pleasure to change both Colorado and Girard slide toppers. Not a big of a project as one might think.
If you have Girard awnings you will need a de-tensioning tool. Easy enough to make.
Be careful of the end plates in that they are of soft cast metal and easy to break as well as IMHO outrageously priced. Spring adjustment is available on their web site. If you can count to ten you are more than qualified.
If Colorado I used a vice grip oil wrench to prevent the tube from turning. on the Colorado I ground a notch into the end plate so that you did not have to remove the tube to replace the fabric. My Colorado had two groves. only one is in use for the awning, I used a long Philips screwdriver to prevent the tub from turning.
I used a Dremel to make the de-tensioning tool as well as to grind the endplates.