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I am just trying to figure out which screws go where and wondering about the middle hole that doesn't have a screw in it? I assume thats to let a screwdriver through to mount a 12mm M4 screw and Tnut to the X axis extrusion?

I also assume you have the washers and 25mm M4 Bolt/TNuT on the back section?

Edit: I also now have a major problem, i put the m5 plain nut into the top of the section as directed, set my idlers up correctly and went to screw in the cap screw and the flat space thats not threaded dug into the nut permanently affixing it to the bolt and ripping apart the little slot where i put it in on the bottom plate. How is this supposed to go together with the cap head screws? I even purchased some that are 100% exactly the same as you listed...

Edit2: Ended up having to rig it together, had to take out the plain nuts and put washers over top of the holes so they idlers would stay at the same height. But it works now.