| 摘要 |
The present invention provides a modifiable backbone having a pair of removable swing arms and a backbone. In one embodiment, the backbone has a bottom, two sides extending outward from the bottom to form a channel, a first top covering a first section of the channel and a second top covering a second section of the channel. The first covered channel section and second covered channel section are sized and spaced apart so that each covered channel can receive both removable swing arms. In another embodiment, the backbone comprises a substantially rectangular block having a cutout disposed between a first section and a second section of the block. In addition, the first and second sections have one or more longitudinal openings to receive the removable swing arms.
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