The problem is that I have no jaw bone on my left. what you see is my Pec Major muscle from my chest ( it's still attached to my chest). When this is moved to the right by the lid it puts pressure on the joint at the top of the right jaw bone joint, hence the pain. When I sit at home with the lid on it's merely discomfort, but on the Van Van at a massive 55mph it hurts.
Front
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Side
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Note the nice scar from the traccy which I'm trying to convince the Grandbairn is a bullet hole from a gunfight with a russian spy.