Adam Accorsini

Hi everybody, new here and I am just looking for some advice regarding my fantic section, I have just been rebuilding it after getting it as a project and I have seen on a previous thread there is supposed to be a bleed nipple for the clutch to bleed it through. I belive mine has had an Allen bolt put in instead I am just wondering if anyone has any idea of the size bleed nipple that was originally used or if there are any other tricks I could use to bleed it through?