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There are four simple steps to try initially:
1) Clean up the seized fastener... use a combination of degreasers, detergents, abrasives and wire brushes. This sets things up for the next step...
2) Search for the term "penetrating lubricant". These are specially formulated to squeeze into the small spaces in fastener threads. Use the lubricant liberally. Use wire brushes to work it in, further cleansing the area.
3) Try to rock the fastener in both directions... particularly effective if it starts to come undone then jams. Add more lube as you go... it should rock a little further each time until it frees up. if not...
4) If seized absolutely solid try a freeze and release spray... very effective and much safer than heat around delicate electrics, heater hoses, brake lines etc.
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Torches & burn them off
