Is this a gear shifter?

[boblalux]

Hi everyone,
Occasionally I repair bicycles for friends, and ever so often I need one of these (red arrowed). I try to find them on Ebay and Amazon, with varying success. What is it called? A rear gear hub shifter, or what? Many thanks

 

[Dogtrousers]

Is it one of these "Shimano Nexus SL-3S41E 3 Speed Revoshift Twist Shifter"
https://www.sjscycles.co.uk/gear-sh...d-revoshift-twist-shifter-black-1560mm-cable/

Or is it just one end of that thing you're looking for?

Edit ... ah ha. I think the bit you're after is called a "Bell Crank" Shimano SM-BC06 Bell Crank Unit
https://www.sjscycles.co.uk/hub-spares/shimano-smbc06-bell-crank-unit/