From your chart with 20 being like a rubber band, I'd say 30 might be more appropriate. But with the piece of original windlace I have being weather and age hardened, that's just a WAG.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
