Edward looked over the pins, they appeared to be the correct ones but they were still a few short. Edward decided to double check the area where Professor Kain had found them and was indeed able to find the rest scattered a bit more. He collected them quickly before jumping back up to his feet "Yep! those are the ones" he exclaimed as he took the others and began setting back to his work. "My dad and I built one just like this a few years ago before I knew he was actually a wizard so we did it all the muggle way" Edward explained as he quickly attached pieces together with the help of a screw driver.
He looked at the pieces and realized that while he was capable of assembling the desk, it was still at least a two person job. There was simply no way for him to get attached the back piece without needing someone else to hold it up. Suddenly an idea popped into his head, he wanted to prove that he could do this by himself since it was his fault they all got in to trouble back in the forest. "Be right back" Edward said quickly as he stepped out of the Professor's office and quickly walked down the third floor corridor and into the Trophy room.
It was full of trophies of course, and Edward only had a brief moment to covet the Hogwarts House Cup before opening one of the cases that was still left empty. Inside were the stands where future trophies were going to be held but at the moment left unoccupied and unused. He picked up one of the larger stands and slowly carried it back to Professor Kain's office where he was able to set it down and use it as a base to help hold the back of the desk in place so that he could screw it in. He was sweaty profusely by this point as it hadn't been an easy thing to carry and his arms ached a bit but it also meant that he would be able to fulfill the request without having to use magic, ask the Professor for help, or stop in his progress. "Don't worry Professor, it wasn't being used and I will make sure it get's put back" Edward said quickly hoping the Professor wouldn't mind his use of ingenuity.