Beautiful little windmill.  Just 1 bolt to screw on with your fingers and you also need to untwist the black center of the flower to put the windmill piece on. Lining up the bolt was the hardest part, it needed some slight bending to get it to fit. Took less than 5 min total. Seems sturdy and spins freely. The box was destroyed in shipping, they need to package it better. Luckily nothing was broken.