When they get stuck, you can try spraying the joint with a can of compressed air upside down and it should come apart. Sometimes a rod will get stuck to the point where it won’t come apart no matter what. My friend gave me a phenix travel rod that became stuck together and he tried to take it apart with brute force and ripped like three guides off the rod. After not being able to get it apart he gave it to me and I tried every trick in the book to no avail. I eventually took the rod to a local rod building company to see what they could do and they too were unable to get it apart. I had them just fix the broken guides and wrap and finish the stuck ferrule just in case. Always remember to lube the ferrules on your rods to avoid problems.