I found an interesting pdf file while searching for pool cleaner parts on the net and thought that someone in this group might like it
http://mpl.mcloda.com/wp-content/uploads/2015/09/Robot-Builders-Source-Book-Gordon-McComb.pdf
Mike.
http://mpl.mcloda.com/wp-content/uploads/2015/09/Robot-Builders-Source-Book-Gordon-McComb.pdf
Mike.