Are centertracs and specs different sizes?

I’ve been playing my Dv888 with a center trac and i decided i wanted to put my spec back in it.
The center trac just falls right out of the bearing seat and the spec stays on one side and not the other.
Also the spec now creates a very noticeable vibe/wobble that the finger trick doesn’t help at all.

Anyone else have this problem?

The first part isn’t really a problem per se. Different bearings can have different tolerances. For the vibe, make sure the bearing is completely in the bearing seat. Make sure there is nothing in the bearing seat except the bearing. Use a different bearing if all else fails.

What is this finger trick you speak of?

When you touch the yoyo when its spinning so see if the vibe goes away.
I think thats what its called

About exactly. It also tests if wobbles go away. I have this problem with my lunatic.