I've got a couple of T Fence Posts I want to remove and the wiggle method is
not doing it for me. I tried to jack them out, but the nubs are not square
enough to keep the jack in place.

I've read elsewhere about removing wood posts with a chain and a jack, but
I'm a little vaque as to what holds the chain on the post and why it digs
into the wood. Would a chain work with my T Posts? Plan B was to drill a
hole and insert a rod and jack against that.

Any thoughts.