[simplex1040]

For the primary wires, it does not matter which side is connected to the switch.
Not too far under the paper the wires connect to the small magnet wire of the transformer.
the only real issue I have had is with the insulation Before under the paper as they are kind of "free" under the bells.
Ron is just making you wary that with any old electronic there is always the risk that something is shorted or could be.

I would not let that worry you. If the transformer does not look burned or melty, it is prob ok. I would not worry about testing it for shorts. I never do unless it looks burnt or melted.