I got this machine in the mail as a gift. It has never been used and it is I guess 27 years old. I am dumfounded by the assembly top where the large food goes when you put a large blade in. We watched the video on the new machines and they show how to put the machine together but the part that is the cover with feed tube and the large pusher goes in with the metal guide. Now I know my machine is old and has plastic guides to go in the feed tube but is it suppose to come apart. I wanted to chop slices of potatoes but had a had time getting them in and connecting the two parts to work. What am i missing here is there another part or is it just harder because they have improved the newer one's. Does anyone have one of these Dlc-7 super pro that could tell me. I did not get a manual.????