This was waaaaay the hardest bit for me. Took ages Almost gave up. Allow AT LEAST twenty minutes. Endless patience pulling, then resting for a bit then pulling again. S.T.E.A.D.Y Keep at it long after your inner voice is saying ‘why did you think you could do this. You have never mended anything in your life.’ Then you see the gap and like a steady bomb disposal expert you quietly winkle it apart.