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Welcome to IIS. I built one a couple of years ago, and as I understand it the distance from the hinge pin center and the bolt hole is the most critical measurement. I don't believe the gap you are talking about will make a difference but I could be wrong. I had a similar gap. Not from the hinge, but because I used a coach bolt as my drive bolt with the rounded head providing a smoother action against the other board, and that head propped up the boards so they never touched anyway.
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