Who does POWER CORD modifications??

I have a piece of equipment that has a hard wired "zip cord" and would like to convert to a removeable cord of much better caliber. The back of the case will have to be modified of course and I want a professional job done. As an alternative, I thought that I might just have the new cord hard wired which would probably be easier and in fact should sound better. I think that a company called MSB? does aftermarket mods. I greatly appreciate your help. Thank you in advance and best regards!