Do I reinstall the x-clamps after using the RROD Repair Kit?

Step 45 on Page 15 of the Red Ring of Death repair kit guide instructs me on how to reinstall the x-clamps on the Xbox 360, however it is not pictured later in the tutorial. I'm hoping that is because the reinstallation of the x-clamps are not required, but I fear that it is more likely due to making it easier to show readers certain important details in the tutorial. I have noticed that several of the screws do not go in properly and I stopped reassembling my Xbox for fear of damaging the motherboard, but I would love to be able to assemble it!