Buying a tool you will use twice...maybe 4 times...kind of a waste. There is a dog leg latch on the underneath...I use a small screwdriver and push it out of the way otherwise it catches under the serrations of the splined section. I take a towel and put it over my wiper arm..nice and thick so I don't mar the metal. I grab a big pair of channel locks and grab on...swing back and forth 2 or 3 times and they are off...if its stubborn, squirt a little WD40 with the spray tip up under the splined area...reset the dog leg latch and do the other one..