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hello Ruan,
Arching or burning motors are very unusual on the 115-117 series.
A bad bearing might be more probable.
I have no idea of how hard or how easily Vorwerks can be had in South Africa, but I suspect the guy that sold the machines to you, he just sold you crap (possibly he was aware of it).
Anyway, I used to work on quite many VK cleaners and they are easily available on any fleamarket here.
Let's chat via mail, ok?
Joe