Rodent wheel with bearings

my gerbils testing it:
http://www.youtube.com/watch?v=wLDjpz_xASU

Some instructions:

1. Print everything except "insert"
2. Insert 2x 608 bearings to the wheel
3. Insert a 1x M8x460mm screw to the holder
4. Cover the smooth side of holder with double sided adhesive tape (remember: the screw must be put first)
5. Attach the closing ring to the wheel
6. Mount the wheel on the holder (remember to put shims next to the bearings, that they move freely)
7. Cover the last nut with