Out of curiosity I just tried the cylinder from my 637 in my 369 but it didn't work, so no convertible for me. Of course, I could always order another .38spl cyl from S&W but that would be redundant. The point of doing my conversion was that I didn't want another .38spl snubby, I wanted a 13oz 9mm snubby.
I know you've all seen it many times but here it is again because I like to show it off.