How to change the sealing ring separately for the rotary cylinder of CNC lathe?

The first thing is to take it apart and replace all the sealing rings. Be sure to keep it clean without sand or anything.

The second type is to install it inside to help the jack, and find a flat screwdriver that is not very sharp and slowly push it inside. After you go in, put the lock block away, and then put the gear set away, and that's all.