Corona Folding Portable Folding Typewriter Model 3 Original Case 1917 w/Case

For parts or repair, i am not an expert with typewriters, currently when the space bar is hit it does not move the carriage, back space works. in one of the last three pictures it shows a small hook on a string that's not connected to something, i am unsure where it goes or what it does, all of the keys swing the letter arm up top when hit, may be an easy fix or something im missing, one arm to hold paper is missing as shown in pictures, also it appears some inscribe there name on the side also shown in one of the last three pictures.

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