Engine Cylinder Hone

This would rate 5 stars if it wasn't for the plastic parts. The plastic adjusting knob is no match for the stiff spring. I replaced it with a 7/16"-14 nut & 1/2 washer. It comes with medium grit stones, I also use 400 grit. The stone holders are riveted to arms. Had to drill them out to replace stones. I used #6 screws and nylon lock nuts since I will be changing out stone grits constantly.