I'd like to bring this to Northwood Airhead's attention. The $20 I spent isn't going to kill me, but I think they should be aware of the situation. The 12pt wrench has a thinner wall section than the adapter; forged vs. machined. BIG difference is strength.
Does anyone have a clue as to what year/models this "flat yoke" configuration is? I'm going to give Rusty Gill a call tomorrow ..... Rusty knows everything.