It doesn’t look like it covers what I had to deal with to fix my Hunter Douglas blinds. (The kind you can lift and close by hand and they magically hold their position.)

They have a spring loaded thing called a “motor” and something with two cones and a string between them, called a transmission.

I managed to restring the transmission, but the motor went zing and broke inside when I was trying to wind it up again, so I ended up having to buy a new motor (I think around $30).