Penetrating oil and compressed air work wonders. Give the pins a shot of weasel **** and then blast them clean with your blow gun. That should free up the ones with a prayer of coming out, and they can typically be removed with a flat head screwdriver and some angled side-cutters with a gentle touch.
Inevitably some will fail. Napa stocks little plastic bags with replacement pins - usually 10 to a pack. Bring one of the surviving pins with you to help match them correctly.
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