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One of the comp adjusting screws on a set of used forks I purchased for the inner tubes was seized. I found that the steel retaining pin had seized the mess together. I eventually freed it after using a little heat and liquid wrench (or you could use another brand of penetrating oil). WD40 doesn't work so well as a penetrating oil.
Take a propane torch and hold the flame away from the metal, slightly heating the aluminum around the screw. Don't heat the screw as much as possible. The aluminum around the screw and down in the tube will expand faster than the brass screw and steel pin. You don't want to heat the aluminum very much, as there is a seal that can be damaged. Heating it to the point where it is on the high side of warm to the touch is about all I'd go. After the heat is applied, quickly shoot the penetrating oil around the screw and use a large, properly sized screwdriver to work the screw back and forth. Use steady pressure, but don't force the screw to the point of rounding off the head. Just keep working it back and forth, applying the oil. You could try this before adding heat, but the key is to use a screwdriver that fits snuggly to the bottom of the slot and as wide as possible.
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