IMHO This video is definitely worth watching.
[ame="http://www.youtube.com/watch?v=2blSqKpHEx4&feature=related"]YouTube- K. H. Stirling, stove, vacuum, test tube[/ame]
The builder has done a very nice job using mostly simple items to build 10 very nice stirling engines and one vacuum engine. The Video is about 4.5 minutes long.
Hope you enjoy it,
Bob B.