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Madness! But if you really want to go ahead I would get a junker zoom from somewhere and practice on it first. Even an expert repair technician in the field I went to years ago refused to pull apart a pentax zoom to remove growth on the lenses inside. He sprayed it with some stuff that killed the growth and sent it grey. I tried once myself once with a cheapy and ended up with a pile of greasy glass. Grease everywhere in a zoom, take care.
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