PasturePro posts are simple and easy to install. Just drive, drill and attach the wire.
Cotter pins are inserted through the hole to attach the wire to the post. The tails of the cotter pin are wrapped around the post and not around the wire itself.
If you do bring the cotter pin tail back around the wire, do not cinch it up tightly. This allows the wire to travel freely through the pin when pressured or tightened.