For anyone interested in how to repair the Hexar AF:
The Hexar AF is my favorite camera ever so I was frustrated when I experienced the (in)famous problem with erratic shutter release/focus. Sometimes it worked fine, sometimes it worked only 30-50% of the time, the inreliability making it an unusable camera for me.
I tried the fix described on Silvergrain
more than once. First time, it solved the problem... for a while. When the problem came back again, the fix only improved the situation a little. Something else had to be done.
I searched around and saw a lot of talk about scarcity of parts. I couldn't find a clear answer to the question "can someone provide a REAL fix for the problem?" (not just cleaning the contacts). I then stumbled upon the camera parts & repair service
that Dirk Rösler/Japan Exposures provides. Basically, you send the camera to him (he's in Japan), and he takes cares of the rest. I saw the Hexar RF among the examples of recently repaired equipment, so I sent an email and he replied that they still repair the AF in Japan. ("They" being Kenko, these days, but according to this post
it's the same repair shop as before, just different owners.)
I sent the camera to Dirk, who was very communicative through the whole process, and after almost exactly a month I had the camera in my hand again. Pretty good for shipping back and forth to Japan (and within Japan)!
The repair ended up costing Ľ21.000 - more than Dirk expected (he hadn't had anyone send in a Hexar AF for this problem before), but apart from replacing the shutter button switch they also did "AF focus adjustment and external cleaning". The LCD wasn't perfect before, but it looks good now, and it feels like the viewfinder is clearer. So Ľ21.000 + Ľ5000 for Dirk's handling fees + Ľ3000 for shipping back to Sweden - that's about $340-350 USD. Definitely worth it to me - my favorite camera functions perfectly again!