Daedalus Nylon Dust Shoe Cover | CNC Engraver Pressure Roller Dust Cover for CNC Router Engraving Milling Machine (80mm Dust Cover)

Please explain how a tool change is done. It looks like the large part (with dust collection hose attached) is pulled off giving access to the bit.s

It appears then that i need either a ring, or a smaller dust boot. my spindle is 3.5" and i thought it was adjustable. can i order a ring to fit?

I have a bobs cnc e4 with a dewalt 660 will this work?

What size is the vacuum port?