Hey quick question for you guys. Just got my Reference 4K 106" motorised screen from Bestbuy and not sure about the L bracket installation. So I recently built a new house and my basement is unfinished. I want to have my screen ready for my PS4 / XB1 and plan to finish the basement in a year or so anyways. So I plan to install the L brackets directly into the exposed joists as you can see per the pic below.
What is really confusing me is the "expanding bolt" item they sent me. I've never seen anything like this before and I'll probably just go to the hardware store tomorrow to get a proper expansive bolt but how the hell do I install this? It clearly expands when I insert the screw.
Do I drill into the joist and then insert the screw so that this neon green thing is sticking out the other end thus supporting the screw and the attached screen? Or is it supposed to be embedded in the joist somehow? The green thing is too wide to insert through the L brackets so clearly it has to rest on the joist right? They've sent me 8 of these as opposed to the 4 expanding bolts that the installation manual says I'm supposed to have.