A mounting system for a photovoltaic module, said system comprising: a structural system comprising a rail including a channel running through the length of said rail, stopping lips and support surfaces, a rocking foot including an interlock adapted to connect said rocking foot to a photovoltaic module, a foot performing the function of a lever arm that rocks the rocking foot into engagement, said foot containing a vertical tab, an engaging portion, and a pivot portion comprising a rocking surface, wherein said rocking foot comprises a spring clip made of resilient material having angled walls and stopping surfaces, wherein said foot protrudes in a first direction away from said pivot portion and said engaging portion protrudes in a second direction away from said pivot portion, wherein the rocking foot further comprises a pivoting mechanism adapted to connect said rocking foot to the structural system, the pivoting mechanism comprising the pivot portion, and the foot extending outward from the pivot portion for connecting the rocking foot to the structural system, wherein said rocking foot is operable to pivot or rock about said rocking surface between an insertion angle and a final angle to cause said engaging portion to engage with stopping lips and deform at least a portion of said stopping lips so that a tight fit between the rocking foot and the rail is realized, and to force the angled walls together past the stopping lips until the rocking foot reaches the final angle, and said angled walls open back to approximately their original angle, and the stopping surfaces engage against the stopping lips of the rail to connect the spring clip to the rail so that the fit between the rocking foot and the rail is maintained. a structural system comprising a rail including a channel running through the length of said rail, stopping lips and support surfaces, a rocking foot including an interlock adapted to connect said rocking foot to a photovoltaic module, a foot performing the function of a lever arm that rocks the rocking foot into engagement, said foot containing a vertical tab, an engaging portion, and a pivot portion comprising a rocking surface, wherein said rocking foot comprises a spring clip made of resilient material having angled walls and stopping surfaces, wherein said foot protrudes in a first direction away from said pivot portion and said engaging portion protrudes in a second direction away from said pivot portion, wherein the rocking foot further comprises a pivoting mechanism adapted to connect said rocking foot to the structural system, the pivoting mechanism comprising the pivot portion, and the foot extending outward from the pivot portion for connecting the rocking foot to the structural system, wherein said rocking foot is operable to pivot or rock about said rocking surface between an insertion angle and a final angle to cause said engaging portion to engage with stopping lips and deform at least a portion of said stopping lips so that a tight fit between the rocking foot and the rail is realized, and to force the angled walls together past the stopping lips until the rocking foot reaches the final angle, and said angled walls open back to approximately their original angle, and the stopping surfaces engage against the stopping lips of the rail to connect the spring clip to the rail so that the fit between the rocking foot and the rail is maintained.