First get a product that loosened rusted metal parts such as Rust Buster or PB Blaster which soaks into the aluminum and loosens it rather quickly. Look over the various rust inhibitors at your local hardware stores, spray where it may seep into the aluminum, let sit for a few minutes (Be sure to leave the nib and feed inside the section) then gradually heat and g e n t l y gripe and twist as if it would unscrew.
Would appreciate others that may have advise on this. A Lapis Gold Seal is a beautiful pen and would be worth being very careful to complete this restoration. God luck, please let us know how this works out for you.
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