Review on Buyers Products 1310410 Blade Caster by Mark Jefferson

I use this on a 7'6" Fisher SD plow. I learned the hard way that the scored plastic part should be removed from the roller that sits under the jack. This part ( the black part) works great for the plow blade itself, but the jack will push the roller out from under it and fall to the ground. They're not very big either. I haven't measured but I think they're about 6" square. They seem to work, but I assumed there would be something more.