Rock Shox 30 Service Manual page 65

Use a long dowel (15 mm - 17 mm diameter) to push the seal head out
8
of the upper tube through the crown.
Dowel
Clean the inside and outside of the upper tube.
9
Inspect the inside and outside of the upper tube for scratches.
NOTI CE
Scratches on the inside surface of the upper tube can cause air to leak.
If an internal scratch is visible, the crown steerer upper tube assembly
may need to be replaced.
65
Damper Removal