How to Build Your Own Deck Stair Gate - - Mama Mommy Mom.11 Aug 2013 . Also, the smallest box of deck screws you can purchase is 1lb, so you will have quite a few left over screws that can be used for other projects. I used approx . I attach the top hinge first as it is always the easiest…..working low to the ground doesn't give much leverage for screwing the hinge on. It really.