We rebuild and upgrade the hydraulic portion of these spoiler cylinders as shown in the listing photo. The OEM seals are past their service life at this point and we upgrade them with far superior material. Rebuild service includes replacement and upgrade of all internal seals and replacement of the cylinder shaft if needed. Repair of micro switches (which can fail as a result of DIY repair attempts) on a best-efforts basis only. 

Please do not attempt to take your spoiler cylinders apart - the risk of damage is too high and you won't be able to find seals for it.