| CPC E04F 11/1817 (2013.01) [E04F 2011/1821 (2013.01); E04F 2011/1887 (2013.01)] | 19 Claims |

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1. An apparatus, comprising:
a hollow sleeve having a first side, a second side, a third side, and a fourth side arranged to form a rectangular tube, wherein the rectangular tube has a first end that is closed and a second end that is open;
a planar base coupled to the first end of the rectangular tube and extending from the first side of the rectangular tube in a perpendicular orientation relative to the hollow sleeve;
a flange extending from an end of the planar base in a parallel orientation relative to the hollow sleeve, wherein a channel is bounded by the flange and the hollow sleeve; and
a first tab coupled to a perimeter of the second end of the hollow sleeve, wherein the first tab extends from the first side of the rectangular tube in a perpendicular orientation relative to the hollow sleeve.
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