I had the chatter problem with this switch. The Brass wheel flanges are not touching common rail. I took the back off of this switch. If I remember right the insulation can get worn (burned) off under the area marked with arrow. Am I right ? Anything else to look for while I have it apart ? Where can parts for these be found ? Thanks, Art
It looks like if you insulate those two green wires from each other, you may have solved it.
Some parts are available... what are you needing? Here are some from The Train Tender: