Yeah, bit silly of me not to include one
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
@Leshaches started
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Yeah, bit silly of me not to include one