Careful with release agent as that probably will damage the rubber.
To be clear, you don't mean the normal, blue can of Wd40 do you, but the silver one that costs more, or either?
Either, just a warning that the normal WD won't do much imo
Try freezer for a day or two or maybe boiling water to try and get a little expansion/contraction to break the bolt and surround bond.
@infmz started
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Careful with release agent as that probably will damage the rubber.