David,
Try contacting Ross Walton at Vintage Aero Fabrics. If he can't help ya, then
he'll probably know someone who can. He's also a good source for the correct
type of cotton. I used his "early glider cotton" on my Wright machine and was
very impressed with its accuracy and quality. I've also spoken to a guy who
used his losenge (sp?) fabric and was very happy with it.
Harry