I'm an Ex IBM Serviceman. Although you gave up and took it to a Typewriter repair shop, (wise decision) I can tell you where and what those pats are. The first pic is of a cord guide roller. This sits on a shaft, by itself, above the OP Shaft. It aids in alighning the transport cord around the take up windlass for escapement, Carrier return, and tab functions. It popped off when your cord tensioner broke (pic 2). As for pic 3...Although this little peg is attached to a case foot, it is there to situate the FRAME inside the case. It also locks down the frame so it won't move inside the case. It is good you saved another from a junk machine. I wish you had saved the whole machine because there are so many parts you simply can't get anymore. You can still get some parts from Coleman Mfg.