The square shaft should not bottom out before the bushing or collar touches the driven tube. When you tighten the nut, the cable needs to have a small amount of end play, it should turn with your fingers from the other end of the cable.

1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy