No worries, you can fit all the mods you want, just get a feed frenzie board from here:
The design takes a 12V power supply, passes that through to the 12V pin on the 4 pin adapter, and regulates a 5V power supply on th 5V pin. 5A max total supported on the 5V regulated power supply. The voltage measures 4.76V is regulated to the 5V rail. 12V rail is unregulated, so whatever you...
pinballbazaar.co.uk
Other forum members might advise other places to get them
When I go to get a power supply for it I will drop you a PM with the details.