Could not find a compass to make a Hartmann mask as described in Paul's article
http://www.iceinspace.com.au/index.php?id=63,187,0,0,1,0
so I made a printable template using Inkscape (free vector drawing program). The attachment is in svg format.
The mask size is for SW ED80 but it can be easily resized. Just open the document, highlight everything (press CTRL-A) and drag the corner of the selection box to scale everything to whatever size you need. You can also use width and height boxes to specify the size exactly.
Hopefully this will save someone some time.
Happy focusing
