I did not detail how to pull out the post and pin.
http://www.tfsr.org/publications/tec...achine_manual/ This place has a better manual than I could ever hope to write - plenty of info on posts in there. There is a set screw on the side of the little canister holding it in. Some times the post is threaded into the canister. This does not cover plastic wonder machines. Their tensions can be anything and much harder to replace.