I've been meaning to make a page explaining some of our processes like plating, so I figure now is as good of a time as any to start getting it documented. Pardon the long post, I can get rather wordy when trying to describe things.
Part of the price difference is geography. It's very likely that the CAL EPA plus the federal EPA requirements make the cost of doing business in California higher than most other places, and all of our platers are in California.
The process for plating hardware involves 2 setups. Once, about halfway through finish, we do a preset where the hardware is fitted for the setup that particular instrument. While the bass is back in spray, the hardware is prepped for plating.
Prepping for plating involves lots of sanding and buffing, more than for the regular polished brass finish. In fact, we don't buff the tailpiece for the polished brass hardware, it's sanded then a clear coat of polyester is applied.
Once the hardware is prepped for plating, we send it to the plater. For chrome or nickel, we take it over to a local supplier (or sometimes he comes and picks it up!). The gold and black nickel are sent to two different suppliers in southern California.
Even to send it is a bit of an ordeal. We make a heavy Maple base to bolt everything to. It looks like a tray and it serves to keep the parts from getting damaged on either trip they are making. It also helps the plater make sure they get all the parts out of the baths, since there is an outline on the board for each part.
Once the parts are back to us, we reassemble the bridge. That has to be done with care, and we have to check first that the plating wasn't applied too thick, or the pins and screws won't fit, or worse, deform the metal when assembled. Some gentle coaxing and everything is back together.
Once the instrument is completed, we get to do the setup again, and you never have to polish the brass.