Craftsman push mower, I hit a brick while mowing the mower stopped immediately, the pull cord will not pull now, after reading some suggestions, I have checked for built up grass, and tried to manually to move the blade, it seems very stiff to me, a couple times I have been able to pull the cord enough to spin the blade but not start it, but for the most part it just won't pull, I'm a widow, and having to learn all kinds of new stuff, any suggestions?