One of my friends used Trouncer today. Played 2 rounds and got her 36 chain badge. Beginners luck or what? O0
I got mine the same day I got that auto. It took me a couple hours to get one for a friend the other day. The tricks have all been posted here but basically, find a full room and set the speed setting right in the middle on medium speed. Then just leave it alone and hopefully the badge will be sitting there when you come back :)