I couldn't find the part I was looking for to fix my window blind. So I made this round thing for the end of the cord. The other item pictured is the: Roller blind pull string fastener by GalFisk Published on April 21, 2017 www.thingiverse.com/thing:2256170 (which works great, just need to ream out the hole a little, depending on the thickness of your cord). Free for commercial use, have fun!