• 44/17, lae, Oswald and fiona66 - thank you for getting back to me with all this.

    I'll go for the penetrating oil, tapping and wiggling today after the rugby, and report back. I tried pushing in by hand yesterday - so far no good.
    But encouraging to hear that the clamps should be a floating/cam system.
    Screwing the bolt in from the other side caused the extra extension shown in one half of the clamp.
    Does this information bolster any repair solutions?

    Thanks again
    David

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