Well, after a lot of contact with some venerable parties in the AERONCA community, I have found that the spring drawing I was seeking may have been obsoleted and replaced with a different type. Unfortunately, there doesn't appear to be a specific record proving this. So I was able to obtain some approximate dimensions for the overall length, coil diameter and wire gage used in the original part. Further, I have been able to obtain the parts from a hardware vendor over the Internet. After installation and test, I will prepare a drawing for my records and logs. It will be available to anyone working this problem but only as my "Shade-tree" solution not as an AERONCA part description. It will reflect that S/N's 115 and greater of 11AC's MAY have been manufactured with a different part.