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
WD release agent
V good point. The fast release penetrant is worth every penny.
@Leshaches started
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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