I have used some pieces of a wine cork in order to stuck the new huge button wheel with the old one.
Four pieces where enough.
I placed four pieces into the plastic button wheel and then i putted it over the old one.
Below is a before after photo of the Atten-APS-1502D
The result was astonishing!
The big plastic wheel offered a great detail and the voltage selection became a piece of cake!
The best of all was, as i said before, that i didn't bother opening the case.
No soldering , no part changing, no gluing, nothing !
Below you can watch a demonstration video before and after the hack.