Picked up one of these posts relatively cheaply as an unwanted unused race prize. It was ok for a while and then started seeping oil and wouldn’t go up. Bought the seal kit from the distributor, followed the fairly useless service video on the xfusion website, put it back together and it won’t stay down. Push lever, compress, release lever and it rises back up. What have I done wrong? Tried google but no joy. 18 psi in the post which I think is correct for the SL. The seal around the shaft seems very basic to say the least.

Mine is the same, Upgrade can service.

http://shop.upgradebikes.co.uk/Catalogue/Forms/X-Fusion-Service