I bought this cab lowered....I want to "unlower" it....what are my options? Thanks! on 1992 Volkswagen Cabriolet

I just want to return it to "normal", friend of mine says I may have to replace "springs"-whats that going to cost? And he said that he isn't sure but some of the years you could lower the Cabriolet by tightening down a bolt on the underside? Help!