22-11-2022, 09:58 PM
The (probably Purves) replicas I saw were opaque plastic but did not have the elasticity of the more comfortable Austin originals which were natural rubber. I feel that the inner tube alternative is worth persuing, possibly with differing sizes for the centre section and the square U on the outside. My first vintage Riley 9 had inflatable cushions by 'The Self-Controlled Air Cushion Company' in Manchester; they had through tubes vulcanised in from top to bottom to prevent ballooning, and were also comfortable.