String experts please help! Answered
First time poster sorry if do something incorrectly!
Anyone who knows a great deal about string I need some help! It needs to have certain qualities.
1. <5mm diameter.
2. Does not stretch.
3. Can be compressed to a smaller diameter.
4. Returns to size when decompressed.
5. Maintains shape after repeated compression/decompression.
I am currently using oval shoelace which works perfectly save for one flaw, after a short time it "breaks in" and loses its sponginess, no longer returning to it's normal size if compressed then decompressed.
The compression comes from two parallel lines of shoelace being twisted together until wound tightly then untwisted fully and re-twisted in the opposite direction, this process will continue through the life of the device. The shoelace starts excellently but then quickly degrades over time. I need to accomplish the same effect with no degradation of the sponginess of the string, or greatly reduced. Any method or material suggestions are greatly appreciated!