Ok; a little more detail in a static image, focusing on the L O N G P O L E M E T A :
From left to right;
- BSUN Linear (Panda)
- TTC Bluish White
- Kailh Black
- Kailh x NK Cream
- Input Club Halo
- Tecsee Zaku
- Kailh Pro Purple
- Gazzew U4T
Notable takeaways for me:
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Kailh Blacks & Creams, while effectively the same length, are not identical. The Cream is ever so slightly longer, and with a lower bevel on the pole - closer to the Halo than the Black.
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Tecsee long-poles are very similar in length to Creams and Halos.
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Kailh Pro and Gazzew long-poles are also very similar, with the Pros being ever so slightly longer.
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Bluish Whites are standard length, but have a much shorter, rounder bevel than usual. KK / Candy switches look like that, too. Edit: actually - the Bluish White pole is shorter than standard if strictly compared to the top of the cross-mount; in this image the comparison is with the top of the surrounding shroud because I used a straight-edge to line these up.
Edit: ( @skepp )
More info on the Bluish White compatibility; Tecsee and Kailh Black stems are also too long to work reliably - on a light bottom-out they don’t actuate, but they do if you push harder - they’d likely work without the silicone plug. Seems to me any long-pole stem is going to be too long to work reliably with that plug in the tube, though ones closer to standard should do alright.
Also - even though the TTC tops are some of the few that fit on Gazzew bottoms, Gazzew tops won’t fully mount on TTC bottoms.