If you have rebuilt and purged them out, (removed condensation) the next step is to mount them and calibrate them to the maingun, calibration composes of aligning these components to the gun, thus the way I mentioned in my prior post, after boresighting the next thing that you want to do is zero the gun at specific ranges. Also you really do not need to calibrate a drivers night sight, just mount it and make sure that it works. Russian T series tanks pretty much follow the same proceedures. Also - how many T-55`s do the Iraqi`s actually have left versus Type 59/69`s.