The oddest I’ve tried is the Duncan x C3yoyodesign “Big Token” aka “Small Fun”:
The token half actually weighs more than the big fun half. And yes, it fingerspins.
https://www.instagram.com/p/Bu_0pqlBo-N/?utm_source=ig_web_copy_link
What are your worst half swaps? I’d love to see them!
I gotchu when I get home
I put together the most extreme half swap I could… half Dread G (80g version), half Smashing Crucible (50g). Massive difference in shape, diameter, and weight, see for yourself 
Again… dead smooth on the string. It does list heavily to the side and it wants to turn because of the weight differential, but it’s perfectly vibe free. Seriously.
dv888 and tiwalker
I wonder how in the world that would possibly work? That just doesn’t make any sense, how can manufactured A grades have vibe at times, but a half swap like that can be dead smooth? Crazy yoyo Gods…
holy crud, I thought I was the crazy one doing this with my Horizon and Atlas like 2 years ago 
lol that and a shutter-canon halfswap were my first insta posts
Post them here!
https://www.instagram.com/p/BYmi1HPBSDU/?utm_source=ig_web_copy_link
https://www.instagram.com/p/BYmkwUEhUiu/?utm_source=ig_web_copy_link
Can’t tell you how these played since it was a while ago, except I do remember them vibing while also being surprisingly smooth lol.
I really dislike starburst response, and one time YYJ came out with a hybrid response yoyo (black knight), half o-ring and half starburst. I found a guy who liked starburst and traded him for the o-ring half. Even after that, I still didn’t care that much for the yoyo with o-ring response.
(I bought the black knight primarily because it was a local boy’s signature yoyo.)
Interesting, I’ve been thinking and wondering why starburst fell so far out of favor, we really only see it on loopers now? It is kinda … noisy?
From my experience it produced too much friction & affected play. If I did a simple trapeze on a Butterfly XT the spin time would be basically cut in half.
Love how you named the Shutter/Cannon swap Shannon!
I liked the Hatlas (Horizon & Atlas) better 
Yeah, but I never met a Hatlas before.
Apparently he’s an insurance agent!
https://agent.amfam.com/stanley-hatlas/il/norridge/4701-n-cumberland-ave/
The names Hatlas… Stanley Hatlas. 
