1. In the gun cleaning kit, you will find three brass rods, the shortest having a swiveling end to attach the handle to.
2. Connect the two longer rods (all pieces of the rod fit by screwing them together).
3. Connect the shorter rod to the two longer ones, so that the swiveling end is on an end.
4. Connect the black handle to the swiveling end (see Figure A).
5. Opposite of the handle, connect the larger of the two fittings (see Figure B).
6. Connect the 12 gauge Bronze Bore Bush to the fitting (see Figure B).
   

Figure A

Rod and handle

Figure B
Rod, fitting, and brush