3z-6h/c does the white plastic seat go inside the spring and then sit against the faucet or does it go inside the hole in the faucet and the spring goes in next?

It sounds like you might be missing a part. Check your list for all included parts. All parts are critical.

Put the large part of the spring into the plastic or rubber washer first, then insert into faucet. I use a little of petrolem jelly for easy instlation.

change cold cartridge call danco if you can

You must follow the below mentioned steps for help :
1: Remove the Left and Right Covers and the Main Case Unit (main cover).
2: Remove the 4 mounting screws from the Chassis.
3: Remove the Main Unit from the Bottom Case.
4: Turn the Main Unit over (upside down) and place on work surface.
5: Inspect the ASF section of the Main Unit for a gap between the white plastic guide and the Chassis.
Note: The size of the gap varies. Even if the gap is not visible, complete the steps
below.
6: Disconnect the appropriate cables and remove the Logic Board from the Chassis.
7: Loosen (do not remove) the 4 mounting screws (the mounting screws can be found behind the
logic board) on the Chassis.
8: Re-seat the white plastic guide so it sits flush against the Chassis. The tip of the white plastic
guide should sit slightly inside the
mounting screw hole. When seated correctly, the gap will no longer be present.
9: Tighten the 4 mounting screws without
causing the plastic guide to shift.
10: Reassemble the printer and retest it.

Please follow the below mentioned steps to resolve the problem.
1: Remove the Left and Right Covers and the Main Case Unit (main cover).
2: Remove the 4 mounting screws from the Chassis.
3: Remove the Main Unit from the Bottom Case.
4: Turn the Main Unit over (upside down) and place on work surface.
5: Inspect the ASF section of the Main Unit for a gap between the white plastic guide and the Chassis.
Note: The size of the gap varies. Even if the gap is not visible, complete the steps
below.
6: Disconnect the appropriate cables and remove the Logic Board from the Chassis.
7: Loosen (do not remove) the 4 mounting screws (the mounting screws can be found behind the
logic board) on the Chassis.
8: Re-seat the white plastic guide so it sits flush against the Chassis. The tip of the white plastic
guide should sit slightly inside the mounting screw hole. When seated correctly, the gap will no longer be present.
9: Tighten the 4 mounting screws without
causing the plastic guide to shift.
10: Reassemble the printer and retest.

If it is a standard delta faucet, the ball is keyed to a small pin in the socket, the
black rubber packing and plastic insert fit together, and the plastic insert is keyed
to the threaded swivel. The springs and seats sit down in recesses in the socket so
everything fits together. On the top of the cover there is an adjustment for tension
which has 4 slots in it, do not overtighten it and remember to use the red capsule
of plumbers grease supplied to extend the life of the seats. Don't try to use the cheezy
wrench to take the allen screw out, but instead a good allen wrench.
(remember to turn off both shutoffs before disassembly and check first).
If you have trouble removing the cover you can use a broken off hacksaw blade
to carefully saw through it or use a dremel with a cutoff wheel and pry it open. Buy a new
one first to indicate how deep to saw.
Hope this helps.

first off, put the spring in the faucet big end down. then put the black rubber boot seal in next and push it into place. Then place the Stem in but be sure to line up the notches before you screw it all down. I hope the will help you....

No diagram available, but I should be able to walk you through the process easy enough. First, make sure your water is off and you have relieved the existing pressure by opening a nearby faucet until the water stops running. Then remove the handle. Under the handle there will be a nut that can be removed with an adjustable crescent wrench or water pump pliers (if you use the pliers be careful not to mar the surface.) Make note of which way the stopper for the handle is sitting, this is the raised piece of plastic on top of the stem. Then after the nut is removed, you can use some pliers to grab the center of the stem and pull straight out. Once the stem is out, inside the faucet you will see the seat (the rubber piece) sitting down in a little hole and under that a spring. These two pieces are typically the culprit for the leaking faucet so make sure you replace these as well or the faucet will continue leaking. Then working in reverse order, put the new items back in place and then before tightening the handle in place, turn the water back on and check for leaks at the handle as well as the spout. If you have any leaks, tighten the nut at the handle if that is what is leaking, or turn off the water and start the process again to reposition the seat and spring. Good luck, you can do it.

#1 THE FAT PART OF YOUR SPRING GOES INSIDE THE FAUCET ,AND SIT ON THE VALVE BODY(SEAT)
#2 THE LITTLE BLACK WASHER SIT ON TOP OF YOUR SPRING
#3 PUSH THE STEMS IN THE CORRECT SIDES HOT ON LEFT.CAUTION THERE IS USUALLY NOTCHES ON THE SIDES OF THE STEMS TO HELP YOU ALIGN THEM IN THE VALVE BODY,
4 PUT THE NUT BACK ON ,TIGHEN SLIGHTLY,TURN ON THE WATER TO CHECK ,IF OK RE INSTALL YOUE HANDLES

i cant draw it for you but the spring fits inside the seat and the seat goes in the hole last. in the hole goes the spring then the seat goes on top then the stem.put the seat on a small screw driver,then the spring then slide it all into hole, try it good luck.