hi, i used to use the duro lock, the bigger 1 that can clamp on gate. i would advise u to use yr spare lock instead of the bigger 1. reason is, the bigger 1 is easier to remove. my uncle whos a contractor, he demostrated by using a hammer or any big tool(cos i din believe him), he gently knock on the side & 1 side of it became lose & out came the whole lock. so end up i use the spare lock. my uncle said its safer to use the spare lock bcos its inside of yr hse & cannot be reached by any tool or object.