i would try and find something like a magic marker and start to wrap the coiled wire around it....that way you could leave it wrapped around the maker for a while to stretch it....then the next day you could replace the marker with something larger....but....you did say it was 9 feet....so maybe a magic marker wouldnt work......unless.....wait.....you-nah....but.....maaaybe.....you know how you can connect some magic markers end-to-end?....you could just.....yea....like a lot of them.....lol.....yea true buttocks worth a shot
Hydraulic wire stretcher