Bowser is out of the steam game, but they may still have some shouldered screws that could work.
You don't have to change the motors.? Isolate the brushes from the motor frame. I slide some insulation from 22 gauge wire over the spring wire that holds the brushes tight.? See?for an example.? Mantua also made a can motor adaptor around 1990.? It's a plastic frame that holds a can motor at the correct angle.? You might find one at a show or on eBay.
