are you talking the bushing inside the swashplate? the one that rides on the shaft? if you disconnect your motor and then move the sticks, you will see that this needs to have the ability to move up and down on the shaft...

you need to power the heli up and the radio, get that swashplate level and also the servo arms... if you have one arm on the left that's say "_____" this long, and one on the right that's "_____________" this long, then when you actuate these servos to be mixed and work in conjuction with each other, the servo on the left will move the swash, but the one on the right is going to move it a different amount and not in the same direction as the left... this is because they leveled... when leveled (arms and swash) it would stand to reason that everything will move the same amount allowing your heli to act better... make any sense? hope it helps anyhow...