Hy to everybody, I'm searching drawing or ideas to drawi and make one head adapter, the bore I will use are: 54mm (little more than 2"), 77mm (liitle more then 3 ")and 96mm (little less than 4").
The better material will be acrilic material to have the sleeve transparent too see "inside" the air flow.
If someone have info please post link or plan.
Best regards,
Andrea