Review on Durable And Versatile Mini Blind Cord For Crafting And DIY - SGT Knots Polyester Lift Cord (100 Yds, Ivory) by Brad Laverentz

I have a whole house's worth of 25 year old shades with cords on the most used shades starting to fail. I used this 0.9 mm cord to fix a couple of my blinds and they work like new again! I bought 100 yd of this cord and it ought to be enough!I've read reviews here about the size of the cord and I can confirm the 0.9 mm cord is the right size as advertised. The proper way to measure is to wrap it firmly 10 times around a pen or pencil and press the loops together and measure the span. 10 turns of 0.9 mm cord will be 9 mm which is a bit less than 3/8 inch. (0.9x10/25.4 is approx. 0.35433 < 0.375 = 3/8) Using a micrometer on an individual strand likely compresses the cord and provides an erroneous reading.FYI 10 turns of the 1.4 mm cord should measure a bit less than 9/16"and 10 turns of the 1.8 mm cord should measure a bit more than 11/16"