• Sacrificial torx key and Wd-40 sound like a good place to start. If needed, my metal shop could help.

  • Use plus gas or the WD release agent.

    Slightly larger tx bit than the Allen key and the turn gently.

    Ally stem and steel bolt, I'd pour a couple of kettles of boiling water over the stem and bolt to see if differential expansion breaks any corrosion between the two

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