As spares are a mjor concern for most vintage drivers I thought you might like this tip:
To prevent the the front bulkheads from getting torn where the hige pins got through: mount a bit longer hinge pins and cut a carbon or G10 brace to sit over the hinges in front of the bulkhead halves.
I've destroyed several ultima bulkheads untill I started doing this and from then on: none = over 10 years and still racing them
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