My wiper arm keeps falling off

Thanks waggin!Thats the one,there is no clip,nut it,s a round plastic bushing with two tabs.This seems to turn into the arm with maybe two threads.I think I,ll have to replace it.Thanks everyone.I,m learning more and more everyday on the Mopars.I,ve worked for years on Chebby,s Ford,s.Mopar 1 1/2 years.