As to the clam shells and the boot: abrasive dirt and grime.
As to the vacuum cyliner, it easier shifting for city drivers, women and future princes. They weren't thinking about blacksmiths and red-necks.
Charlie
BTW: I hope all out there are enduring the winter satisfactorily. As for me, thanks for asking, it could be much better. Like yesterday. The missuses's car has a flat. The sun was a-shinning, the birss a-singing, the temperature was in the low 80s. Even all bundled up, I wasn't about to go out there in that. Brrr. I sure am looking forward to Spring. Am too!
