It will fifth from 5 inches to 7 inches so yes it will
yes you can take it apart and put it around the item, feed the end through the gap below the screw and tighten it
#104
If the clamp is totally submerged, there should be no issues.
That would be 7" diameter
I think that 5" is the minimum. The slots are necessary for tightening and you will be an inch short