If they overheat, you can twist the head off of the screw.and then you’re screwed. Let them cool for a while if you have to. Feel them with your fingers to make sure they’re not too hot. I would highly recommend you twist one screw for a few turns, then move on to the other. Even with pre-drilled holes, the screws heated up quite a bit as I fought them into the studs. I used a level to make sure the base boards were perfectly vertical on the wall before I pre-drilled those holes. I pre-drilled holes into the studs for the lag screws so that they would be easier to drive into the old wood. This was important because I would be mounting other boards directly over the lag screws. I used a 3/4-inch drill bit to widen the hole on the top so that the washers and screw heads would be even or below the surface of the boards. I then drilled holes through the boards for 6-inch lag screws. I cut two 18-inch sections of 2×4 with mitred ends (for looks, not required). The third photo shows the base boards I bolted to the studs through the plaster. Here’s the completed wooden construction. They’re behind a tv so nobody can see them. You can fill in the other holes with spackle and paint over them, or you can leave them like I did. This line roughly marks the center of the stud. In the second photograph above, you can see where I marked a vertical line between two holes in a stud. When you hit a stud, it’s much harder to drill down and you’ll pull back some wood chips along with the plaster. These thin boards are called lath and totally prevent the stud finder from finding the stud. With plaster walls, the best way I’ve found for finding studs is to use a very thin drill bit to drill a series of tiny holes. The plaster is applied to a series of thin boards which are attached to the studs. Since the walls are plaster, you can’t use a stud finder. You can see in the first photograph above that I did some searching. My first task was to find the studs running vertically in the walls. It may be overkill, but I don’t like expensive TVs to fall down. I used a mitre chop saw, but you can buy a mitre box for a hand saw for around 15 bucks. Since they hit the wall 2×4’s at an angle, you’ve got to mitre the ends. Attach horizontal 2x4s to the ones mounted to the wall.
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