One thing i'd like to mention about these stands. I built one last year for my grandfather, to make it easyier for him to start his planes, instead of bending down to the ground. I think it was the second or third time we used it, and he put his hand straight in the prop to tune the engine. I think he wasn't used to the plane being higher off the ground, and he would usually stand behind it, when tuning it. So be safe and remind everyone with a new stand to pay attention!