Thank you for the link, I dont think I have the means to accurately size the spring other than length and width. I would assume compression strenth is important, if it was not the same as the other spring it would set the blades off balance. It still sucks scraping a perfectly good pump over one little spring.
They suck. My vanes wore out after a year and it was barely used during that year and ofcourse they wont sell those either. I lightly sanded them and figured I was going to screw it up but it didnt work anyway so big deal. Turns out it works better than ever now. If you hold the vane against something flat you can see that it is uneven and if you carefully sand them they will work again. Maybe I just got lucky. I also found a vane manufacturer online that said he could duplicate them if I sent the old vanes to him and the price was very reasonable.