Here you can convert existing RSS feed into new RSS feed with unsummarized, full content. Full content will be taken by following RSS item link and downloading complete page. After that, page will be cleaned from site navigation and other stuff and full content will be merged with original item.
Service can try to detect original content of the page automatically or you can specify it. If you want to specify it manually, you have to provide prefix and suffix in HTML form. Everything between prefix and suffix will be treated as content of the page.
Please, note, that for some feeds it is forbidden to modify them. You must read feed usage agreements before converting them using this site. This site must not be used for illegal activities.