we   tried a  9ft  Vicon   on  a  1955  last summer  --   we had   clutch disc  issues.    as in  slipping  of the  main clutch  with the 9ft.

the vicon according to  our  dealer  weights more than the  Khun or khun based units  ( by  those I mean the companies that make frames and attach Khun bars)    

we  did  try the  mower this summer on a  285 MF  and  the  rockshaft twisted --- but that might have  been  soft metal in the shaft, or  our  employee  doing something  ( ask me if you want to laugh)
and on the 285 we also got  clutch smoke with this mower...    and  so  with the  damage  it has  recieved  we are considering  trading it off .