ended up going online and for 20 bucks got the kit with 50 screws. the hardest part was finding the original joists. i then would go a few feet further on the same joist to get a line going. worked pretty well once you get it set up. i had so many screws sticking out that everytime i turned around to run a line i would catch my self (knee) on a screw head! i needed alot of reference points to use, then another good idea if doing it this way is to count your screws before putting in and then when snapping off the top part, keep count so you won't have one sticking up somewhere you missed snapping off and won't step on it. that wasn't from experience just a good idea i had so i wouldn't be speaking from a bad experience! see ya....