Result of last night's experiments. I have modified the top two layers of the bogie sideframe to increase the material to the side of the rivets, then laminated together. The rivets were then pressed out with a scriber using the cut holes as a guide. This has the effect of curling the sides:   After laminating to two more sideframe cuttings  (without the additional material) and leaving under a weight, the sideframe starts to flatten:   The sideframes are separated and the extra material
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