Hamster wheel MOD

Hello, if you wnat to sleep during the night this MOD is mandatory! the hamster of my daughter during the night run like a cheetah, so i make a mod to a market standard wheel with 7,5 mm hole. Probably, if you want apply this mod to your wheel you have to verify the measures.
The mod aim is to add a bearing skf 6001 in order to reduce the friction and the consequence the noise.
Regard

Jonweb