You don't just "lash" it to a pole, at least I don't. You find a larger limb (or whatever), "slot" the end to allow for the shaft to "surround" 2 sides of the knife's handle and "then" lash/attach it, via paracord (or leather's even better) to the knife. Works well...(I've tried it)!
Hope this helps,
Capt. Chris