A standard bat ferrule cannot be tightened. A ferrule insertion of 10-10.5mm is best. If using a standard bat ferrule, you will need to either cover the bat ferrule insertion side with a pipe, or purchase or manufacture a suitable sleeve connector. The grip and end cap use new materials. For those who understand old, used, and repaired items. For those who can proceed with transactions smoothly. For those who understand Japanese. Only for those who can properly handle necessary communications. Old Rod Rod Building Topwater