This is amazing, wish I found it several months ago before I bought replacements. Two of my Levolor blinds broke in the same exact way, the cord wore down the small piece of plastic that handles the locking mechanism. Clearly not designed to last and an obvious scam.
I purchased a home with those blinds. Every single one of them has worn a groove into the cord lock, rendering them unusable. Absolutely ridiculous, and fixmyblinds wants $11 for each replacement. Problem is, even after replacing the cord lock, 6 months later they're broken again.
I went with cordless shades from blindster.com, and they're performing great (knock on wood).
