All my pins have a short length of chain or wire attached just to prevent unscheduled losses.
I even safety wire my 3 point adjustment turnbuckles since I learned that lesson.
PS, soft aluminum wire is great for that. (thanks to hydro crew)
I'm definitely going to wire up the pins next time I'm out mowing. The chain on this pin didn't do so well though. I found the chain, detached, on the mower frame, with no sign of the pin.