Here's a pic of a diy grapnel I made. Works really well for setting a traverse. I obviously stole the idea from the yellow grapnel being sold. This one only needs a couple dollars of 8awg copper wire. I keep it in my weaver ditty bag with a hank of throw line and a throw bag. The good thing about it is if I sit on it and flatten it, it bends easily back into the correct shape.