Working on a late 1960s Yale forklift model#: G51C040NFS071 and we cannot figure out how to remove the counterweight. The reason we are trying to remove it is because it started to separate from the rest of the machine at the top of the counterweight. We removed (actually broke off) the 1" bolt at the back lower portion of the counterweight (big bolt that goes in the hole in the counterweight just underneath the oval slot for the hitch pin). The counterweight is now slightly loose but will not break loose from the machine. Are there other fasteners or what are we doing wrong? Thanks!