Hi guys this is driving me barmy,
I’ve checked face and vertex normals, concave faces and ran clean up on the mesh too, there arn’t any border edges either - what else can I check?
If you need the model to look at it can be arranged! i really appreciate your help!
What exactly is the issue you are having with the boolean? I’m going to go ahead and guess that both objects disappear when you try running the difference boolean. If you upload the .ma or .mb I’ll gladly take a look and see if I can figure it out 
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