FInding the blades is the easy part ...
I have found blades that I think will work, but have not been able to figure out how to replace the old blade. There appears to be a large pin with a screwdriver slot on one end that is necked down on the other to take a small nut. The structure is such that a socket will not fit on the nut. I can grab the nut with channel-locks, but the force required to turn the pin is excessive. At this point, I have working but worn wipers and do not want to break the pin and have no wipers.
Any thoughts about what to do with this will be appreciated.