Nothing more frustrating than to have a goal in mind, and a mental time-frame of when you want to finnish the job----------and the damn machine won't cooperate! Yeah, the dremel was likely less impact than a sledge hammer, but after all that hassle, a sledge hammer is better at stress relief!
I have always associated the worn down white procelain on the 'tags tubs with years of heavy use------not years of overloading. I suppose it could be some of both. Lots of jeans, overalls, etc. with stiff fabrics and heavy metal buttons and zippers to scrape along the tub as they make the turn and start their way back up from the bottom of the tub. These machines in "farm" service will really show some wear!
My older 'tags (early sixties type Highlanders) with either the solid center-post or filter type center-post agitators ALL have great roll-over. It is fun to watch the action with three or four pair of stiff new jeans comprising the load. LOTS of splashy action! Like most machines, I guess it just depends on how you load them, I have a pretty good eye for what looks just right for a load in these old machines. One wash cloth too many and the roll-over stops-----but that can also be said of many other machines when overloaded.
Hope you guys are having fun and look forward to seeing the 142 up and running with the "new" tub------mission accomplished!