The guy who did this:
Used a chain saw but he had a bracket to mount it to the timber and then slide on a square steel tube to hold the chain saw at the exact position to plunge cut the base of the post.
It can be done.
Unfortunately right after I took this picture my camera lens motor broke and I couldn't focus the camera any more.
I did take some pictures of him cutting one but you can't see anything as the pictures are too blurry.
Jim Rogers
