FYI, my tumbler also started getting louder, slower and eventually stopped. Out of desperation (translation: I'm broke) I disassembled everything. The only moving parts are the rotor and two sealed ball bearings. The electric motor doesn't have any brushes or anything else that can wear. The only parts that can go bad are the two ball bearings. What happened with mine was the seal on one of the bearings wore through and let dirt get inside which seized the bearing. The bearings in my tumbler are 626-zz, and they cost $1.14 each @ thebigbearingstore.com. I bought an extra set since the shipping charge was the same, and the total came to $7.35. My tumbler must have been gradually getting slower and noisier with age because my brass is getting polished in half the time and it's much quieter than it was before it died.Had the older (rounder bowl) one for a few years, then it started to slow down and make noise. So I got the Hornady, but the Frankford started working again and still gets some use. Funny thing is if you turn them both over, the mechanics looks identical.