[Xuli]

There has been a few questions/topics on this forum about this and from what I have read, you can use a small amount of vegetable or Olive oil if you can slide the wheel off from the stand. I did that with mine and it's worked no problem.

I slid the wheel off then got a little vegetable oil between my thumb and forefinger and gently rubbed some on the part where you slide on the wheel. Try to avoid other parts if you can. I don't think a tiny bit of vegetable oil would hurt them if they were to eat it.

Hope that helps you