Welcome to MTo. You’re right to be concerned about Al liners corroding. I just had a late 1980s-ish Climber arrive with the blades & tools strangely immaculate, but with crud under the scales & the most corroded liners I’ve ever come across. An outside liner is actually disintegrating in one place. I have a lot of used SAKs & while some corrosion is common, the good news is that I haven’t come across a case anything like this before. I would go with Myron’s advice here.