re: #16 wrenchwench

They’re a big deal? Not just for parakeets?

I don’t know. I’m using Spy and your tweet didn’t come through completely - no picture.

コロコロ (also ゴロゴロ) = go around and around, or to whir

芯 = usually means “core” or “in the middle of”

中 = center

So it wasn’t clear what was going on.