The original CompTip was installed with a thru bolt (sister screw). We went very quickly to one, as done in production, that is held in by the shroud tang / hound rivets... and epoxy. In either case the tip can be bonded in with automotive Bondo epoxy. It makes a very stiff connection and is easy to work with / find.
Installation instructions: http://static.hobiecat.com/digital_assets/13070100CTIP.pdf
These cut lengths are for the current system. Yours may be installed above the tang by 12" approx?