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@hilarystone
A 16 x 100mm bolt and two nuts will take out even the most stubborn fixed cup and does not rely on gripping it by the flats. Screw one nut down about four cm, place the end through the fixed cup from the inside and screw on the second nut on the outside. Tighten this nut with a socket whilst holding the bolt head with a spanner. Then continue turning the outside second nut until the cup unscrews.