Just so you don’t have to go try to dig them up yourself, the links for the Car Talk puzzler I included “for fun” on the last homework are:

The puzzler itself (“Tire mounting… with but a few letters“), and the answer.

Also, you’ll notice that “guarantee” is misspelled there, by the way. That is to say, I just copied and pasted their error without seeing it. I do in fact know how to spell “guarantee.”