The design of the two "wings" needs improvement. The wings extend out at the bottom of the pin and do not retract evenly on both sides when squeezing the retraction handle. One of the wings protrudes out further and can get stuck on the edge of the hole as the pin is being pulled up for removal. A little "convincing" is necessary sometimes and finally the pin/wings can be pulled thru the hole.
When looking into an exchange, I checked another unit at the store and found it to be made the same. I found the pin was a tight fit on my Craftsman tractor so not a lot of wiggle room for pulling...
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