Bearings in 3-speed gear box

[Wombii]

If I remember the gear box internals correctly, the reason it's advised not to replace with ball bearings is that those bearings need to both slide and roll freely. Ball bearings are usually not very good at sliding. Glue prevents them from popping out of the plastic thing from the push/pull force.
I have a feeling I greased that instead of gluing in my current build. Thanks for the reminder to check.