Fortunately the bolt eventually came out. What my picture of the press does not show, however, was a large board of 10mm ply which I stood behind when operating the press....because extension pieces flew out of it with a terrifying rifle report.
Above, some of the nuts, bolts and ratchet sockets used to force the axis bolt out....with evidence of having burst sideways to escape the 12 ton force. Just as well I hid behind a shield when operating the press!
Because I hadn't been able to shift the tube in the eye of the spring, I'd assumed it was an interference fit, but searching through a parts manual, it now seems that the tube was a metal sheath on the bush. The line inside the eye (Note) makes it clear that the tube is not in the eye. Part 3 is a sandwich with rubber in the middle. I shall now have to find out where replacements can be bought, though I believe that these days nylon is used more commonly.

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