Final Drive issue

I have a problem with final drive, the issue is I lost the spring when disassembing it, and I tried to make a new spring from a pen, but I don't know length of the original spring, can someone measure the spring from final drive for me, I only need length and diameter. Please make my cosmic pegasus work again!!!!!!!!
Buying another FGrin is a good option. You should'nt dissasemble any of the Drives