Use bench vise soft jaw inserts to prevent damage to the seatpost or any seatpost component when clamping it into a vise. Clamp each component
only tight enough to prevent it from spinning in the soft jaws. To prevent the part from slipping, clean the vise soft jaw inserts with isopropyl alcohol
and a clean shop towel before use.
Clamp the lower post into a bench vise and Park Tool® AV-5 soft jaw
1
vise inserts, with the post head facing down.
A2: Remove the retaining ring from the lower post.
2
B1: Pry the scalloped end of the retaining ring out of the groove. Slide
the pick around the rim of the lower post to pry the retaining ring from
the lower post.
Push the upper post up to expose the poppet valve housing base plate