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I have a 15kg projector with a mount. The place I need to attach it to ceiling is smack between 2 joists. The projector plate which ideally should be at attached to joints in 2 places has 4 holes depending on which way joist runs. Now as I can't get the ceiling mount at a joist I was thinking of attaching a board with a number of wood screws to the 2 joists. My question is will a board take 17kg of weight or will the projector just rip the screws out of wooden board. My other thought was to use bolts and bolt plate to board so that the plate can then not be ripped out of board. Only problem with that method is that the tops of bolts will be forced into ceiling when I attach board unless I use some spacers