(Find the charging cord, find the instruction booklet, find the buttons for macro mode, etc.)

Here's a picture of the bushing:



Starting in the center of the bushing is the hole for the firing pin, then comes the surface which supports the primer, which I'll call the face. Next comes what I have called above the "lip." I can't tell if this is part of the bushing or is part of the aluminum of the frame. After the lip comes a narrow gap, and then finally what's clearly the frame.

The picture shows the face of the bushing is below the frame (to the left from this view). The lighting doesn't show that it's only a little below the frame on the opposite side, but this is where the primers hang up.

What I called "a narrow gap" is wider in the region where the bushing's face is low.

Those more knowledgable about the construction of the old K frames might better describe what is seen in this picture.