parts and service manual for ryobi saw

i need some info on this saw someone gave me a ryobi C 4620 its the pic on the right side the one with the side cover off it looks like i am missing parts pertaining to the clutch. i was able to match it up to a new ryobi at the home depot and it looks like mine has missing parts . i wss able to make some cuts with the saw but the blade kept getting loose then fell off. the picture on the left is the one i saw at home depot the two other pics are of the saw i have .

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