※ I am also listing this on other platforms, so please comment before purchasing. (There may be cases where the item is sold out due to timing, such as late at night or during work hours.) After returning from a fishing trip, I washed and wiped the inside of the reel spool and removed the spool to dry the line. I forgot where I put the drag knob and couldn't find it, so I bought a new one. Now that the original has turned up, I'm listing it. [Compatible Models] Part Code: 66J784401 (19 CERTATE) LT4000-C LT4000-CXH LT4000D LT5000D-XH LT5000D-CXH (21 SW CERTATE) SW5000-H SW5000-XH SW6000-P SW6000-H SW6000-XH (23 AIRITY) LT4000D-XH LT5000D-CXH There may be other compatible models, but these are the ones I know of. ※ Please understand that this is USED, and those who are overly sensitive should refrain from purchasing. (No returns, refunds, or exchanges.) Thank you.