<p>Hey guys,<br /> I just purchased one of these puppies on eBay, and found the aperture blades to be unresponsive when I slide the toggle down to any of the f-stops, which leads me to believe that they're stuck or disengaged. Also, the 1/50 speed on this unit does not fire the shutter, while the other speeds seem to be responsive to firing. That particular speed setting only yields a click, but no firing on the shutter. This camera is equipped with the older pre-WWI ball bearing shutter, which is quite simple, from what I understand. I have no real experience making a repair on a shutter, so I was hoping to get some advice on how best to proceed in making this repair, should it be possible for a novice to do. Any input would be appreciated!</p>