Stabilizing the top of this helmet:
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This is the only way that I know of how to stabilize/solve this problem. Using the tin support disc as a template a circular patch is cut out of new leather and then stained using leather dye.
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Proper leather contact cement was used here. normally, I would clamp this for drying but this is too delicate and would require special clamps.
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Small pieces of original leather were taken from a donor helmet and used to fill in. Once this has dried, I will add some original shellac finish to fill in these cracks. It won't be perfect but will be covered up by the spike base and support disc. I can't fix the dent caused by the spike as this would need to be wet with a solution of water and vinegar.