I think the schrader valves are connected to tiny air bags, hence the low volume.
Bummer about the fork bushing. Perhaps you can try some surgery on one of the rusty for legs, and see if you can extract the bushing. The forks are really easy to dismantle.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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