efenix728,
I have a person in mind that may very well be able to help you in this endeavor. here is the info you need to contact them.
Kaye Sellon
KSELLON@BILLSWELDERREPAIR.COM
HTTP://www.billswelderrepair.com
I hope this helps you.
Respectfully, Jeffrey S. Grady
The pictures You posted shows the machine to be set up for 460 V.
To change to 230 You loosen the nuts and move the copper jumper bars to the positions marked 230.
You will most likely need to feed the machine with larger cable, as the amperage draw will be 2x wat it was on 460 V.