Is there any reason you cannot convert a 110v power supply to run off 240v by
> using any split primary toroid mounted inside the unit concerned?
> i.e. make safe all secondaries and take the 110v from half the series
> connected 0 ----110v --0----110v primary?
Not /any/. Of cause it need to be powerful enough. And it needs to fit :-)
Is it possible to change the mains transformer from 110 to 240v?