Taiwanese Mill Drills badged as Naerok, Warco, Nu-Tools, Sealey, Whitecote, Excel, Draper and Ajax, etc. . Although not machine-specific in content, it covers the the "Minor", "Major" and similar variants and, being a double-edition manual, it should help with most versions.
This page displays all the content on the website associated with the '500M' model. Numeric models include all prefixes, such as 'Number', 'Mark', 'Size' etc.