I need to replace seals and also want to change springs on the front end, my question is can i do this without messing with the closed cartridge? if not what special tools are needed to service the cartridge as well? Is there air or oil in the cartridge. If oil how many cc's are recommended, air psi? Im definetly mechanically inclined enough to do it, just wanna know what im getting into so ive got required tools. Last set of forks i was in was 01rm250 totally different! THE BIKE IS 08 250sx if it matters. Thanks alot.