Thanks guys! Yes, my main concern will be the splines. Its been too darn cold to really look at this but given the position of the wiper arms, something had to "give". It would make my day to find that the wiper arm was the sacrifical lamb and not the underhood components. The idea of a wiper stand-off may or may not have helped in this situation. This recent blizzard laid some heavy, very wet, wind driven snow in short order then, turned to rain for a bit and back to snow. AKA= heart attack snow. I'm thinking a physical stop/block/perch for the wiper arm would have helped or complete removal of the arm itself would have eliminated this. Once we get a bit warmer here I'll have a closer look at the damage. Keep your fingers crossed