HI Tod, my first post talks about my Bandit Arf/Jetcat P60, certainly not over weight at 19 lbs.The standard springs lasted less than 10 flights. I replaced them with the heavy duty springs you sent Len Mcintosh in NY. When I compared them to the new set of Bobcat Pro-links struts,from Len, they where just a few mils. shorter, same dia. coil thickness.
Exercising the full travel of these struts such not stretch them.
Pics of the Bobcat with the right side lower because of the sprung spring,
Rcpete