Ok, I've never heard of a "Tough Tool". I bought my 19-38 a couple years ago off CL. I just wasted a roll of 40 grit. When it came off the drum & started "thwap" sanding the inside of the housing, as the right side didn't clamp.
Does it help with the double finger/trying to clamp dance? It wasn't in the manualor the product diagrams I got, either...