The washing machine analogy is a mystery to me. Wexler varieties are a mystery too. Both make sense to very few I guess and I think the fewer the better. Enjoy.
I picture the guy’s poor mother (a very grand mother, but not quite a grandmother) with Popeye-like forearms lifting up a wringer and throwing it. And the use of the indefinite article “a” leads me to think that this very grand mother had countless wringers lying around, thus she could afford to throw one of them about now and then, possibly for exercise, possibly to knock some sense into her son, who probably was not all that grand at all.