i have had the shaft replaced three times and it last about a year before it starts to make a cracking noise. he played lots of sports in school and was also going to get the sports scholarship for college. whoever writes a bad review, i put their name on a list, and they're going to get taken care of one day down the road. not understanding the state of your credit health. we will bring samples of our products for you to see the quality for yourself. your blends questions answered and some other stuff. this works well for the most part. 