I have a small problem. You have to slide two bearings over a brass tube. The tube got stuck in one of the bearings and the bearing came apart. I'll have to see if I can get another bearing from someone. I hate to have to buy another unit. The unit is pretty nice. The give you an extra pitch slider in case you brake one. The instructions suck. It doesn't show how to put it on the Ikarus motor with the prop saver built into it. According to the thrust numbers that come with the motor, it should be enough. Plus I think the weight savings helps also.