If you go to their website, you can log in and submit a trouble ticket describing the problem. They will respond promptly with your repair options.
I bought my MCD shades in 2008. I have had two manual shades fail, both as I pulled them down ...the spring mechanism broke and they would not roll up. The first I shipped back to MCD, the second I dropped off last week and picked up two days later on my return trip. Both times, they did what they called a "Gen III to Gen IV" conversion. This time I had the choice of them sending me a new spring for $30 plus shipping, or having them do the conversion for $50 plus shipping. Since I was going that way last week to visit family, I did the $50 version.
Paul (KE5LXU) ...was fulltimin', now parttimin'
'03 Winnebago UA 40e / '05 Honda Odyssey toad