The metal parts of the unit are too thin/weak. A bolt snapped off as I was loosening it to try and make adjustments. (part K) The calibration will be difficult due to the fact there is a wobble of the metal closing plate, which is attached to the axle that swivels back and forth. The metal plate controls the closing and opening the holes. All they need to do is use a type of collar to create a better fit. ball bearing set up would be best. The metal rods that attach to the handle, that attach to the metal plate I just mentioned are not long enough. They are adjustable but its not possible to create a fully open, or closed position. There is a plastic stop I moved the plate to and set the bolt K at for fully closed. I had to adjust the bolt to its furthest most position in order to achieve this. They recommend .5 of the rod length to be exposed as a starting point and then adjust by screwing or unscrewing said bolt (Part K) as needed to fine tune. Its coarse at best. The rods need to be longer to allow further adjustment. I could get it to fully close at the furthest point, but doing so, unable to achieve a fully open position. Because the rods aren't long enough. Overall poor design, and cheap materials make this unit flawed and too easy to break. Unreliable. I didn't even get to use it. This could only be used in situations where calibration and accuracy wouldn't matter.

Does what it’s supposed to do… hard to tell exactly how much product is dropping and adjustment lever is a bit temperamental.

Can't honestly evaluate how it works yet since some of the bolts sheared off when putting the spreader together during initial assembly. If they can't hold up to a girl tightening them then I am worried how well this product will hold up. This is my 3rd spreader I have purchased from this manufacturer one lasted a year. The last one lasted for 2 years before breaking. They were different models and I just knew with the size and durability of this one it would last. So far it has failed out of the gate. I did contact the manufacturer and they shipped out new screws so we will see once I finish assembly how it works and holds up. Make products in America Again!

UPS refused to deliver it, then lost it. Tractor supply was no help, then told us it was the only one available. So, we never received the product. The whole experience was terrible.