The Super Trekker, and I imagine the Pro Trekker, have two integral and parallel aluminum stays. These come from the factory bent to conform to the population; that is, there is a lumbar-region curve and a sacral-region curve which combine to give the spine's usual S-shape when viewed in right profile. Custom bending these stays is the place to start. Unfortunately, the stays on my Super Trekker cannot be removed; they can still be gently bent to better conform to your spine.
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