I find lanyards very useful on working knives. My working folders and my machetes have them. A long lanyard can be attached, then shortened by using a chain knot. The lanyard that is chain-knotted can be opened up to the appropriate length as needed.
Please see a good Internet article by Bill Hay (2004) "A Primer on Lanyards" accessed at bill-hay.com/Lanyards.htm The article has pictures and is worth reading.
Faiaoga

Please see a good Internet article by Bill Hay (2004) "A Primer on Lanyards" accessed at bill-hay.com/Lanyards.htm The article has pictures and is worth reading.
Faiaoga
