I hate to admit I'm a little foggy on the recollection, but I seem to recall doing some fine soldering with a piece of like maybe 14 ga solid wire wrapped around the tip of a soldering gun, using it as a fine extension of the regular tip. This was in the days of low-melting genuine, honest-to-gawd 50-50 solder, though, like 1950 or so, maybe later.
Hope that helps --sorry about the cloudy memory.
ETA: I think maybe I used one of those wood-burning irons with the wire wrapped around that instead of a soldering gun. Just not sure.
Hypno-regression, anyone?