[37silverstreak]

Hey Eric, those two cans are your Intermediate Frequency coils and the recessed screws are adjustable capacitors for aligning the coils to the 455KC frequency. Don't touch them for now. After you get your set working you can adjust these to peak the sets performance. To access the coils in the cans you remove two nuts underneath the set and the exposed nut on the top. the old wires are soldered to lugs on the coils and are pretty easy to replace. Just be careful with the coil wire itself, the wire is very fine and easy to break.
Kevin