IIRC some people were having trouble with the cylinders coming unlatched with heavy loads in the early model 29s. The recoil would cause the cylinder latch to move foward. I think the solution was to install a heavier latch spring. But I am not sure. This is an old, long ago memory. And my memory is nothing you want to bank on. But I bet an inquiry at the S&W forum would answer that question.
A village in Kenya called. They want their idiot back.
"The difference between genius and stupidity is that genius has its limits"... Albert Einstein