Just got a rolleiflex k2a that was stored 40 years with a stuck shutter. I removed the lens elements and took it down to the speed control ring and flushed it out with lighter fluid. The good news is it now fires and sounds good, bad news is at about 1/25 and slower, the shutter sticks open till I rotate speed ring to a faster speed. I didn't take any of the clockwork apart, pretty sure I got all the spring loaded parts in place when I replaced the speed ring (3 parts as far as I know) and put VERY small drops of sewing machine oil on the shafts of the slow speed gears. Any ideas where I went wrong or maybe pics of how it should look?