I've gone off maffi on the f18, they kink and knot easily and absord lots of water.

With a conventional sheet you want to pull out the inner core for about a foot, stuff the d12 up it and cut it to how long you want it to be, whip the d12 furthest into the sheet so it stays there, pull it about half a foot from the end, taper the outer core stuff it up the d12