Here's what prompted this bit of thread-reanimation on my part.
I was recently offered a decent deal on a 629-6 by a coworker and couldn't resist.
I now own a 5"bbl 629-6 marked "629 Classic" on the left side of the barrel with S&W marked Hogue rubber grips. I was going to take the cylinder/crane off to clean the revolver and found to my surprise that the screw that used to perform that function doesn't exist anymore!
I don't know for sure that this happened between the -5 and the -6, I'm not a 629 expert, I've only owned a couple and the most recent model (before this one) was a -2.
The manual conveniently doesn't even have an exploded diagram or a parts list and has absolutely no information on disassembly.