Congrats on the ETRSi. I love mine, and I hope you like yours just as much.
I'm curious, what type of film you are shooting (slide, colour, or b&w)?
The reason I ask, is that I've pretty much stopped caring about how exact the edges of my VF are. I primarily shoot B&W, which I enlarge; so I am always cropping and re-framing at least a bit. With C41 & lap prints, the lab tends to do a bit of cropping (645 doesn't fit a 4x6 or 5x7 print perfectly), and if I want to make a real good print, I'll scan the negative and print out a guide / sample crop of what I want them to print. As long as I capture slightly more than I need, there is no harm.
Slide is the only time the edges really matter, and since I don't project my slides, it is a non issue for me.
It should be pointed out, I'm also a pretty "sloppy" photographer who tends to be happy with the sunny-16 rule as often as not...