We have a proper tool to assemble reservoirs , but there is never a need to remove them ,unless they are destroyed . I would imagine ,like YSS, Ohlins provides their service centres after satisfactory completion of schooling with a service centre kit , which would include all the tools needed. Have you done the school? Are you interested?
I run a school 4 x times per year in our factory for our international service centres. Graduations usually at the sportsbar