1. A corrugated washer, comprising:a plate with an aperture, the plate having a first corrugated surface, wherein first corrugations of the first corrugated surface extend parallel to each other and are shaped to engage with second corrugations of a second corrugated surface of an L-foot bracket; and
a pair of prongs that protrude outwards from the plate on a face that is opposite the first corrugated surface,
wherein the pair of prongs include a first prong and a second prong, and
wherein the first prong is located at approximately a vertical center of the corrugated washer and the second prong is located below the first prong in a vertical direction.