my clutch chattered because a former helper of my grandpa thought he could fix a stuck clutch by playing with the adjusters through the hole with no plan on how to do that. The fix for that was to properly adjust the fingers when the motor came out for a bore. I think there are some threads about methods of adjustment in car.
my chatter was when releasing the clutch on take off a wop wop wop wop and then gone once fully engaged and not noticed when shifting between gears or cruising.
here is a video I used as a clutch adjustment guide. the video suggests 3/4in it worked for me. I have seen differing opinion from 5/8 to 7/8
https://www.youtube.com/watch?v=3CHUZTgyf0g