These are the same style micro knobs that can be found on a range of Befaco products. They are strictly designed for T18 Shaft (Doepfer style) Potentiometers which you can buy HERE.
Warning: Fit on proper T18 shaft pots only, buy them HERE. While it’s tempting to fit onto the Song Huei Tall Trimmer Pots – they are extremely hard to remove again from tall trimmer pots and it’s very easy to damage your pots or module in the process. You will also likely not be able to remove your module front panel with these fitted onto Tall Trimmers Pots.
Internal Depth: 12.5mm