Paf,
Forget about all the yada yada of pink wires with purple spots and
hertz here and amps there…
Just go to Amazon and type in Goldsource STU 3000 Step Up Down Voltage Transformer
and buy it for $100.
Bring it with to HK and plug it in.
It will run all your machines easy.
I had the same problem and I use it to run all my USA machines,
including a vacuum oven and lathes.
Here is the link.
https://www.amazon.com/Goldsource-STU-500-Voltage-Converter-Transformer/dp/B0022QOSDK/
Trust me, it’s that simple.