Now I do.
I know it’s unusual to have the Pilot episode so late in the series, but here it is:
(top to bottom: 2+1 Legno, Evolt, Ridge)
You’ve got to give it to Pilot, while other brands are sharing identical internals and sometimes whole designs, they have gone all the way in the opposite direction with one different mechanism for each multipen. Even the clips and eraser holders are not interchangeable!
The mechanisms are clipped more strongly than on the Tombow/Penco/Rotring and Surari Sharbo where weak clips are held in place by a pin when the pen is assembled. Here the attachment is more akin to the one found on the Sharbo X LT3 so I didn’t try to open them further for fear of breaking it. But it’s enough to see that the Evolt uses an overall larger mechanism, with wider components and springs.
The Ridge and Legno are the same size and seem to have some parts in common but the Ridge being enclosed (like the Surari Sharbo) prevents a more detailed observation. However, the grip attachment is different despite the similar diameters.
Both the Legno and the Ridge have six protruding tabs inside with a detent pin on the external rotating part to provide the “half-stop” position described by @Linus2K
