The metal strap is also not always connected to chassis ground. In some cases, like my Crosley 148, one capacitor has the strap connected to the 1st audio plate. The .001 MFD lead goes to the chassis, and the .03 MFD lead goes to the grid of the output tube.
These capacitors are easily disassembled, and tubular metalized film caps fit nicely inside, if you are interested in restuffing caps.
T.