Here's the problem:
686+ (dash 3) with very little use, essentially new.
Lockup, timing, and SA trigger pull are absolutely perfect. Cylinder turns freely.
The DA trigger pull is smooth up until about the time the cylinder locks. But then (as the hammer continues back, up until it releases) the trigger pull becomes substantially heavier. If I'm careful with the trigger, I can definitely feel the point where it gets heavy, and it almost feels like something is binding up. The pull remains heavy until hammer drop.
In additon, some cylinders seem to do it worse than others, which leads me to think it's something to do with the hand or ratchets.
Tore it down completely. Found a little roughness inside the frame window, where I thought the hand might be rubbing. I carefully smoothed that roughness out with a file, but no change.
I also very lightly touched up some rough edges on some of the ratchets, but again no change.
No other burrs or roughness, everything inside is clean and oiled.
Is this maybe a characteristic of the 686+? My 29 and 696 certainly don't do this. Or could something need adjustment?