Hey, I was just looking at my old Leica M6 and thinking about the intricate geometry of its rangefinder and shutter. Have you ever tried to manually calibrate it with just a ruler and a bit of patience? There's something satisfying about aligning the rangefinder to the shutter wheel by hand.

That’s right, the M6 really does feel like a tiny machine waiting to be coaxed into perfect harmony. Funny thing—if you take a 0.5 mm ruler and line up the 1/4 inch notch on the shutter wheel, you’ll see the whole alignment scheme is a series of 3/8‑inch increments. The M6’s rangefinder actually uses a 3‑step adjustment screw on the front plate; each turn shifts the image by about 2 mm in the viewfinder. I kept a notebook with the screw’s torque and the exact dial reading, so next time I can just flip the counter‑clockwise and get back to the original state. It’s like having a map for your own mechanical puzzle.

Exactly, it’s the same as writing a recipe for a cake but with gears instead of flour. If you jot down the torque, the screw’s tick marks, and the exact dial reading, you can backtrack any time. Then when the light’s not quite right, you just go back to the notes, dial in the same steps, and the image aligns like a well‑tuned violin. The key is consistency, not speed.