Update 2015-03-01: some source-files for this drawing:
- rigs1_2_3.ai, dated 2001-12-30. Adobe Illustrator format. Inkscape seems to open this - tested on Ubuntu 14.04LTS.
- rigs123_individual Individual files with rigs 1, 2, 3. Adobe Illustrator.
- rigs123_freehand dated 1999-05-XX. Freehand (Mac OS 9 version). Let me know if some modern free program opens these!
See also update from 2004: IOM Mainsail geometry.