Necchi M680C Mechanical Sewing Machine

We have just bot a Necchi super nova 35-0121798, made in Italy, the all SS machine; the light switch, is broken off; while dis-assembling, the wiring to and from the transformer lost all it's insulation, which would indicate a brake-down in side the transformer (?) Though the machine was still working fine, if a new transformer were available I would likely go with it. The price of course would matter.
While I could and might have to solder on new insulated leads on the outside, if no new transformer were available; I also need a new twin switch, or a single switch handle for the old switch, the one spring inside the switch is getting very tiered.
(a finicky job, I should have left well enough alone)
Thank you for whatever help you can render, ........ Yours Reg