I gave up my Dremel tool because it won't rotate anymore. It's been sitting in my toolbox for years and I figured YouTube could explain what was wrong with it. Youtube explained the problem and ordered the part number, easy to install and works fine now. The only troublesome aspect of this whole experience is the price you pay for a small piece of plastic that probably costs less than a penny. Just under $9 for this piece of plastic shows they know how critical it is and can charge as much as they want. Se la vie.