Vertical Alignment
Vertical Alignment
Having just done this on my RD-1 I can let you know that the instructions are easy to follow and the screw turns very easily and you then have an aligned rangefinder!
Actually you may have to do it twice - but, given that, you can then do it yourself for the rest of its life and it is well worth learning.
The only part I had "trouble" with is if you leave the top plate on you have to hold the adjusting screwdriver at an angle to get at the screw but you get used to this quickly. BTW - use a thin jewellers screwdrives to allow for the angle.