Bearings Falling off

[JesusC]

Hey, is anyone else having this probel, the bearings given to us in our kit of parts, they keep sliping off the wheels when we put any sort of spining force on them.

We altered 2 oour wheels, and that would explain it, except that the ones we did not alter also slip off so we cant spin our wheels at all.

Any help would be useful. Thx!