Mike,
Over the years I have had numerous opportunities to see 101's with spinning levers... They are very thin because of the way the metal is shaped to allow the two angled firing pins to pass through the center of the break open lever. It looks like a section of drill rod that has had an hourglass cut out of the center. Way too little metal is left...
Then some guy gets a couple of swollen reloads and thinks that it won't open because the lever hasn't been "turned" enough and "viola" those two little thin pieces of metal left break and the lever spins...
Very nice shotgun except for that one little flaw... And, that is really operator error. It's "opened" but the cases have swollen so the lever doesn't need extra "umfff", its the break open that needs a real knee in the middle and a soft turn on the lever... Oh well...