For ease of use go with hot melt and a PROPERLY prepared shaft. For strength and durability JB Weld is the only way to go. The key is proper prep of the shaft. I like to use a brass bore brush of the right size for the shaft chucked in a drill on LOW speed. A smooth and quick in and out is all you need. Follow with acetone on a q-tip until it comes out clean. Use the acetone on a rag for the inserts and you are ready to glue them in. Spin test them and allow to cure because you are not getting them back out if done properly. Oh and I like to push a little bow wax into the insert where weights screw in before I clean them with acetone. This prevents any epoxy getting into the threads and making difficulties in life.