I had picked up some defect bottle stopper blanks of Esty for short money to try to get the hang of turning acrylic since my turning experience it really only on cork and foam cores and occasionally some hard woods. so I turned this one and thought why not see if it is suitable for coring carbon fiber sleeves.
Attachment 335601
It don't seam to want to stick to the blank so some zip ties will hold it in place until it sets.
Attachment 335602
The inlet for the knot will have to be re drilled or reamed after it sets. I turned a dowel and wrapped it with parchment paper to make the carbon return into it. If this holds the base will be parted off and I will turn something to be the base. Maybe some silver or black plastic of some sort.