your friend is probably sketchy haha
and llyod if you wanna get your bearings out of your metal core
sit your wheel on a vice thats opened up so that your wheel can sit on top of it but your bearings are not touching the vice top.
Get a front wheel axel and put it through one of the bearings so it hits that spacer thing in the middle but it doesnt go through the spacer.
Then get a hammer and hit the head of the aaxel which whill hit the spacer which will push the bearing out.
The other bearing should just come out if you hit it with something