Brake compensator

Hi all,

My rear brake compensator has developed a slight weep from the single fitting on the end. From what I can see there is something that threads into the body of the compensator and the brake line goes into that. None of the other inlet/outlets have this. The leak is from the piece that threads into the body. Has anyone ever removed this?
I'm guessing there must be some kind of seal on it that has given up (copper washer perhaps?). I don't want to spend £150 + vat to have it refurbed as it seems to be doing the job it is intended to do and if I have to replace the whole thing I'll go with a MK2 version.
So wondering if anyone has ever taken one of these apart and can tell me if there is a seal in there? Would rather know what I'm getting into incase I remove it and it all falls apart!

Ta

J