I'm not inclined to panic, this lens lends itself more to contemplative shooting but I know exactly what you mean: it's unnerving to pull a lens apart and reassemble it in the field. especially when you have cross threaded the odd device in past lives.
Originally Posted by ContaxRTSFundus
I'm not a portrait photographer, but I have found this lens impressive with close up subjects at its spherical aberration wide aperture settings
With the right subject and lighting--usually moderately contrasty subject brightness levels--a hard to do otherwise "glow" (or fuzziness around the highlights, to be mundane) can be obtained.
Regards - Ross