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WD40 for hours then a hairdryer on hot might loosen it up enough to budge.
I’m not sure if it was even bike related, but I remember seeing a riveted or solid piece of a component that looked like it had a pozidrive slot, but it was actually only to keep the part steady or something and it wasn’t an actual bolt.
Eseman
It's neither ph1 or ph2, which makes me think it's JIS - which I don't have. I'm not going to turn a socket to try and disassemble a 15-20 yr old part in the hope of fixing it, lol. I took my shot and failed.