I made these all at once. I ripped the slot in the edge of a mahogany board. Then I ripped the edge of the board off in a strip, so I had a few feet of bridge. My fingers were far from the saw blade at all times. I used hand tools to cut them apart and shape them. This might be a lifetime supply. More likely a four year supply.
Here is a slideshow of how I used to make bridges..I do it slightly diferently these days....I don't cut the saddle slot on the bandsaw anymore Just click on the image