OK Lane. It was the tension cable I didn't have straight. Now I can visualize it. (Although I'm not sure I could make one.)

There has been some postings in RMMA about an inflatable guitar that is being developed. It is meant to be a serious instrument that will sell in the US$600 range.

If that intrigues you like it did me. Look at:

http://www.chrysalisguitars.com

Murray