I've tried several different types of string, and haven't been able to find the correct replacement that holds up and doesn't tangle. One of our cats decided to start chewing on them a few years ago (has since stopped). Taking the blinds apart and restringing isn't a big deal, but none of my fixes have lasted for any length of time before strings start to tangle and/or break.
It's stranded, thin, strong, I haven't found anything available commercially that matches.
Anybody successfully repaired these types of blinds?