Then it is fit the seal to the oil seal cup, screw it home and tighten using the special spanner you have just made for the purpose. Then you can take the upper one off again, because the lower shroud won't fit over the oil seal cup.
Having re-fitted the oil seal and cup, the unit can be slipped into the frame, but it takes a little trial and error to find out how. You then slide the upper shroud part way down into the frame and fit the special lower conical flat section spring inside it (again, a lot easier said than done) and slide the upper shroud down into place (without letting the conical spring jump out again.)
The main spring (another special, with thinner section wire due to the lack of clearance) will drop into place and all you need to do then is compress the main spring whilst screwing the special top cap on. That is relatively easy! Fit the locknut, then the oil filler cap (all made new from stainless) and your damped plunger mechanism is installed.
Having rebuilt this set, I can safely say that I know why Ariel never put the system onto production bikes. As far as I know, only about 10 sets were ever made.
The engine should be easy enough now............
