Keep in mind that those five-wire coils didn't wire like the ones you'd see in a typical 2500 set, where there are two coils in one with four leads. The five-wire ones were just tapped at different points to allow them to work on party line circuits. In your case, the red and black leads are the only ones that are used; the slate, slate/red and blue leads should be insulated and stored.

The capacitor needs to be wired in series with the red or black lead when connected to the incoming tip/ring. It is strapped across the set's terminal block near the top, so it should be easy to locate. You should be able to get away with strapping terminals A and L2 together with the black ringer lead on L1 to make it work.

Ed Vaughn, MBSWWYPBX