this is a great addition to my self propelled lawn mower, I no longer have to lift the trailer off the ground when using the mower to move it (5x10 with sidewalls), plus I no longer have to remove the ball from the mower to use my service trailer. I installed this on my Husqvarna 18542. I had to drill a hole on the left side for the top screw (I didn't want to move the spring which appears to be tied to the deck arm), installation took less than 20 minutes and lifted my ball 8.5 inches off the ground to 20 inches off the ground