1. Try pouring cold water over the joint.
2. If that does not do it try heat on the outer section and ice on the inner section.
3. Still no success? Try warming with a hair dryer. BE CAREFUL NOT TO OVERHEAT IT! The epoxy holding it together is usually heat activated and will weaken when hot.
4. If trying alone hold the sections behind your legs at the knees and pull (carefully). Do not twist the rod but apply a steady pulling force on the sections.
5. No go? Try pulling with a friend, keeping your hands close to the joint
6. Still no luck ? Take it to your fly shop and try their ideas!