Old 07-27-20, 04:09 AM
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Join Date: Aug 2007
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Don't loose site of the primary objective, that is having a secure hinge clamp.
Its apparent from the photo that there has been no metal to metal contact in the area of the hole since the paint is in good condition.

I would speculate that the area may be for a small piece of cushioning plastic. Dahon uses some HDPE on one there hinge types.

If adjusting the clamp spring tension with nyloc on the spring shaft gives insufficient tension , experiment with cushioning materials in the area of the whole.

I had a halfway but sold it to a friend several years ago, nice bikes
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