For Ultimate Jigging 30mm Reel Knob Upgrade and Replacement, please carefully see below "Pictures" (click to enlarge) to show the installation process step by step.

Ultimate Jigging 30mm Reel Knob can be directly assembled on the reels as below： 

• Daiwa - Any reel marked "S" on Japan Daiwa catalog
• Shimano - BB-X Sephia, Stella 1000 ~ 3000 (Japan model), New Twinpower 2008-2009, New Stella FE 1000-4000, Stella FA, FB 1000-4000, FD 1000-2500. (FD 3000-4000 might need a 40mm Knob or 40mm Knob Type II)

To install the 30mm Reel Knob, you need two 7x4x2.5 Bearings. Normally, you will find them when you disassemble your original knob from your reel; however, some reels are coming with only one bearing and one sleeve, but, you still can use those to install the knob.