Top of agitator wasn't moving properly

(For those who have a weird sunken plastic cube slot instead of a nut or screw to remove) The dog teeth were worn down. Generally this is an easy repair. It happened once before to me with a Whirlpool and I knew immediately what I needed to do. HOWEVER, when I popped the plastic cap off the top of the agitator (this model doesn't have the fab softener dispenser) what I found was a surprise. It wasn't an 11mm nut, it wasn't a screw, it was an inverted cubed slot made of plastic (not sure what those are called) that looked like it needed a 3/4 - 1 inch socket drive to go into it. I had nothing that would fit in there to get any leverage to loosen it up. Frustrated, I began grabbing everything I could find to shove in there that I thought might grab to no avail. In pure desperation I grabbed my wife's garden shears (the common little hand-held kind that curve at the end) and it was the perfect size to wedge in just enough to grab the corners of the cubed-shape slot. It took just a little force to loosen and I was able to unscrew it by hand after that. Then the repair was just as it normally is. Remove the top piece of the agitator, remove the spring piece and slip the plastic part up to remove the dog teeth. Replace, put back together in reverse order.