If you turn the key to lock it and it turns partway and stops then the handle is out of alignment. When you turn the lock, you are pushing a plunger out into a recess in the handle base. If it is out of adjustment, the the plunger is not lined up with the recess in the base.
To adjust Alignment of the handle-with the base mounting screws loose, look at the notch in the base and twist the base, assuring that the lock plunger hole in the center shaft is centered in the notch. Tighten base mounting screws. (If alignment is off, the key will catch when locking)
Using an appropriate sealer such as RTV, seal base of handle so that water cannot enter the door behind the base.
With the handle pointing to the right, place the cover and grip on the inner cylinder until the cover touches the main housing.
Insert the small ball bearing into the hole located on the right side of the inner cylinder cavity. (a small dab of grease my help to keep the ball in place during assembly)
It may be necessary to move the handle up and down a small amount to install the ball bearing so that it is flush with the inner cylinder wall.
Put the key in the lock and turn to retract the lock plunger.
With the plunger pointing down and retracted, insert the lock into the inner cylinder until the plunder engages with the square hole in the inner cylinder.
Twist the key and remove. The handle should now be locked.
Tighten the two setscrews in the handle enough that the handle is not loose.(A SMALL AMOUNT OF PLAY IS BUILT INTO HANDLE TO ALLOW EASIER LOCKING, THIS PLAY IS NOT A FACTOR IN THE UNLOCKED (FLYING) POSITION)
Complete annual disassembly, greasing and checking of the screws is recommended.
For more detailed disassembly/assembly please refer the articles on the left.