I first found the FW shop when looking for a belt. I had a replacement belt in my mother's machine case, and when I tried it, it made the slow machine worse, so I bought one from that famous online shopping place, which stopped the machine completely. I noticed the FW shop had something they called a super belt. I read the materials description and having worked for a rubber company, I thought this might be a good idea. I was amazed! Their video shows them with an RPM gauge, and I didn't need to use mine to see what an amazing difference it made. So far I have put one of their belts on 5 machines, and was very pleased with the results each time. I too got the cleaning kit, and have used it on half a dozen machines. And I agree, their videos are great!