I'm working hard on my Hasselblad repair studies, but I'm still working to graduate from the "knucklehead-boob" level.
Edit: There's one thing I CAN tell you, is to make it clear to the service people that you want your chassis length on the finished job to be 71.40mm on the money, or infinity will be all fouled up. I've currently got 6 Hasselblad bodies up in rotation on the worktable, and only one of them is nearly dead-on. The others are off, and infinity is all over the place, compared to the ground-glass back I fabricated. Every one of these bodies had undoubtedly been serviced in the past, which goes to show you need to find yourself a very attentive man to do the job. Service "experts" seem to be rarely that.