I was not going to reply but..... Years ago I bought an 8" Two passes and it slipped so bad, it made enough heat to burn the paint off......
When I called them they just gave me a huge run around So I had it cut open by a local fairly decent converter company,,,,,, Before he cut it open he showed me all kinds of poor craftmanship on the outside and the inners were just as bad. He asked me if I wanted to weld it up to sell to someone,,,,, I chose to scrap it.