In Reply to: Dearborn 10-80 tailwheel spring length posted by ScotB in AL on March 05, 2017 at 16:18:20:
The Engineering drawing from Dearborn Motors for part 103138 shows a spring that is 9 1/2 long hook-to-hook. The O.D. of the coils is 1 1/4 and wire diameter is 3/16, with a total 42 1/2 coils. This was apparently sourced originally from Southern Iron & Equipment Company. This ought to get you in the ballpark.