Hi Brian
You are totally right, I should have mentioned the continual maintenance.
Many people have said this problem occurs because the hinge deforms and twists because of lack of maintenance, I could not find any evidence that twisting had happened and all areas were well lubricated. I inspected the hinges in operation opening and closing the bonnet, everything moved square and in-line as it should with nothing showing that it was twisted.
I am very please with the result and hopefully this will help others with the same problem.
Would be very interested to hear what other people feel had twisted on their hinges.
Paul
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