Originally Posted by Styrak
cetane and gear, those are not impact grenade pins and do not help him at all.
OP, even though it's not a closed loop, some tightly tied paracord would probably work just fine.
All my grenades are impacts and those are what I use. When I first got mine I had the original pins tied to the nade with string and still managed to loose them. Then I made my own. Works good, still could be tied to nade but easy to clip to caribiner in vest and ring is big enough I can put a gloved finger through it and keep playing with it on my finger until I can stow it.