87 cadillac coupe deville starter knock its not the engine knocking because I checked when I go to start it up on a cold start it starts

a little weird it has a slight knocking noise but starts up after 10 mins ill turn it off then when I go to turn it back on it makes a really loud nocking noise and dosent start my homie told me something about the starter not catching the fly wheel properly he said to lose the starter and lower a little and insert a shimy in the open space then tighten it back up I wasent sure what that does but he said that it will move it closer or away so that it will catch properly its funny because if the engine is warm then you try to start it it makes the loud knocking noise and Dosent start but does fine on a cold start any help advice tips information much appreciated !

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