thanks for the answer ... yes i know the square vs spread bore. This is why i need to add the adpter that will get 1" additional in high. I don't know if the space in high i've will be enough for the swap.
Rsperas got your suggestion and probably the most working one but i need to go to harbour to get qjet high and check how much i've available as spare then move with Summit.
Consider that i'm leaving in Italy Milan ... boat in Tuscany ... will get time but i don't see how different could be at the stage.
Thanks a lot for the reply or any other, ciao.
Nick