Gottlieb duotron pinball machine project for sale. Pinball Doctor Coin-Op Amusement Repair and Maintenance (406) 545-4824 (Let it Ring!) Posted on February 10, 2016 by pindocMarch 23, 2016 I bought this machine a couple years ago. It has a problem with the startup sequence which I have not been able to fix selling at cost $250. Billings Montana.