| 摘要 |
According to one embodiment, a method comprises coupling to a slotted tube a member having a passage. The method further comprises aligning a passage of an arm with the member's passage, and coupling a through-surface coupling mechanism through the aligned passages, wherein the through-surface coupling mechanism forms an axis about which the arm can rotate. According to another embodiment, a system comprises a slotted frame comprising female slots. The system further comprises a member coupled to the slotted frame, the member comprising a first through-surface coupling portion. The system further comprising an arm comprising a second through-surface coupling portion, and a through-surface coupling mechanism for coupling through the first through-surface coupling portion and the second through-surface coupling portion, thereby providing an axis about which the arm can rotate.
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