I am trying to locate a source for post jacks to sukppord a large 3 story deck. The post jacak I remenber is two telescoping steel pipes with holes drilled in the pipes. A large pin can be inserted into the hole to adjust the height of the jack. The top has an insert with a threaded part used to make the final adjustment. Please e-makl me if you know where I can purchase such a post jack in the Austin, TX area.