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Yes, several times.Has anybody actually ever done this?
Yes, and they worked fine.And is it possible to put it back together again?
Now that is a bit more tricky!Is is necessary to dissolve the varnish or lacquer?
Maybe it would be easier to wind my own. Is there a common source of iron laminations and bobbins to fit?
As Dirty Harry said: "A man has got to know his laminations"
Depending on what size of custom transformer you need micro wave oven transformers
That varnish is specifically made to resist solvents since finished boards often get sent through a hot vapor flux stripper process. Taking apart finsished transformers is a royal pain and usually the wire is destroyed in the process. I have saved the bobbins and cores and rewound them with new wire.If it is a really thick coating of varnish, or the transformer has been "vacuum impregnated" which gets the varnish between the laminations, then you are on your own.
As Dirty Harry said: "A man has got to know his limitations"
JimB
Why not have a look at this page which is intended to teach you how to "roll your own":
https://ludens.cl/Electron/trafos/trafos.html
Thanks for that link, really good stuff. I spent a good bit of time reading his autopsy and subsequent re-engineering of a blown inverter too. That was a great read.
https://ludens.cl/Electron/chinverter/chinverter.html