This was a problem that I'd had previously with this mixer. The worm gear, which is designed to fail (so that more serious damage does not occur to the motor), did fail while I was mixing some multi-grain bread dough. After the previous failure (pre-youtube days), I took the machine in for repair. The repair-shop cost came to about $150 in labor. Parts were extra. This time, I decided to do the repair myself, since I figured that I knew what was wrong. I found the appliancepartspros (APPros) youtube video on how to do the worm gear repair. It seemed to be the most comprehensive one out there and was the one that I decided to follow. The prices that APPros offered on the repair parts were also at least as good (and often better) than I found elsewhere. When I used their on-line help line with some questions, I was impressed with the support that I got. The only letdown was that there was a small part, an alignment pin, that I wanted, that APPros did not have unless it was included with another major part. I don't know if I'd lost the pin or if it had been lost previously in the repair shop, but the APPros video had not highlighted the importance of these easily-lost steel dowel alignment pins. I later found the part separately at a small local repair shop for $5. Including the $5 alignment pin, the total repair cost me less than $20 in parts. The APPros video was instrumental in my undertaking the repair, and the APPros on-line support was outstanding. Next time, this repair won't take me nearly so long. If I wish to repair another appliance, APPros will be my first on-line source for parts and "how-to" videos.