I believe that the Lelit combi PLO42QE is similar to the Quaha Napoletana II. If this is true then this link should be useful as there is an exploded drawings document at the bottom of the page. http://www.lelit.com/web_eng/gamma_scheda_tecnica.asp?id=68. Also http://demisgfh.googlepages.com/napolitanastripdown should be useful.
hope that this helps