-- How much do you want to read. --
Not any more on this subject, beyond what I bump into in other research, thanks.
It's a collusion between Cruz folks at state conventions with state and local Republicans who oppose Trump. The SC story makes that clear. All delegates are selected at some of these state conventions, even the ones won by a candidate during primary votes.
I'm also very tired of this subject, and maybe enough voters will be outraged to bring about changes in many of these states where the rules allow such maneuvering. '