also these are useful
http://www.college-sewing.co.uk/PartsBooks/Singer/211G165_166_265_266.pdf
http://www.industrialsewmachine.com/webdoc1/used/used-brochures/211g.htm
Keith Dickson
March 2009
Sorry1 Can't answer your question but I'm searching for a 211G166 manual myself and thought maybe you now had a solution.
Kevin
February 2009
E-mail me below and I will attach a complete list of sites.
Ken