From Giles Ward Sent Sat, Feb 10th 2018, 03:09
These are 6mm like the Tama, but the indicator line is in the wrong place. On the Tama the line is parallel to the flat. https://www.ebay.com/itm/Through-Panel-Extension-Knob-for-6mm-Flatted-D-Shaft-Pots-/121906343448