Just got a Samsung Q70R 65 inch and was trying to figure out how to install some seismic belts. Looking into the holes in the back all I could see was a hex head for a screw or bolt located at the bottom of the hole leaving me completely confused as to whether I needed to pull it out to get the bot to put in or no. The instructions say absolutely nothing other than to use a 41/43mm screw to attach the straps. I contacted the Samsung support chat and it was no use as the 'pro' told me to have a technician install the screws. So I kept looking into the hole at different angles and finally saw that there are some threads there. Looking back on it now, it's a little embarrassing, but you'd think Samsung "Pro" would have mentioned there were threads in the hole. I'm writing this so it can help someone else which is the same confusion as mine lol.
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