How are you doing the flip trick? The best way for me is to hang my paper over the flamed side, make a few referance points,( mirrors, door lines , what evers there.) Then rub the paper with the flames taped out under it with a dark crayon, Move the tracing to a hard surface ( I have an old table top I covered in bed-liner that works great for this, its just soft enough to let the wheel cut the paper) and run a good pounce wheel along one side of the flame ( inside or out side of the tape rubbing) then transfer the paper to the other side, line up the marks and run a piece of chalk along the pounce line. If I ran the wheel along the inside of my rubbing then I'll tape along the outside edge of the chalk line. The hardest part is not rubbing off the chalk wile you tape the flames.