I Built , No "Re-built" the stab around the carbon tube.
I put the inserts on the one with holes by placing the glass tubes
on the carbon first. Use the glass tubes that go through the fuce
as spacers when modifying the new stabs.

You Could secure the stab(s) to the side of the fuce with a 90deg
angle aluminum, instead of the screw in the end of the carbon tube.
Probably be easier, but you would need Two of them ; one for each side.

Bille