Some metals won't shine well (D2 for one). What are you making the bolster from?
For minimal tools It would be hard to beat sandpaper up to 2000 grit or higher. Because I had it on hand I've been using metal polish (like for shining the brass on your uniform, not the paint on your car) and it takes it another step better. This could be in lieu of a buffing wheel.
- Paul Meske