the ball swims around inside as the swashplate tilts during flight.
See the tip of the screwdriver? Okay, well the upper swashplate ring has FOUR linkage
balls. Two short and two long. Use the shorter ones for learning and switch to the
longer ones (right photo) for more sensitivity in flight. Don't use the longer ones until
you're proficient or you'll just crash more easily. The longer ones will double the throw
on your flybar paddles.
Make a spacer out of plastic, use a thick-walled straw of some kind or fuel tubing. It sits on the
C locking ring and extends upward as the plier jaws depict. The length of mine is 9/16”.