Any question answered...

1.Caliper arms twisting to accomodate disparity between the rim and pad parallelism.

1. Too much slack between the two caliper arms on the retaining stud, this needs to be a medium between being too tight so that the arms do not move freely and too much where slackness is introduced into the braking mechanism/action.
   
   

I need diagrams preferably done in crayon and big arrows

The housing is compressing

squidgy outer