i had the same problem when i put my wla into service. all nos parts except the drive itself.
here are a couple of tips once you find out if your spiral is installed correctly.
first, make sure your cable and drive are well lubricated and not binding. it should turn free with little resistance. the drive gear doesn't stand a chance if the cable is not turning!
second, carefully examine the spiral gear for any debis from previous gear failures. any bits left in the gear will quickly destroy the next one you install! i used a dental pick to clean the bottom of the spiral.
third, you might try using one of the brown fiber gears instead of the brass ones. they seem to be able to hold lubrication better. i used white lithium grease on the spiral and drive gears.
and finally, check for any binding with the rear on a stand before you attach the cable. you may be able to detect any problem before you run it and wreck yet another gear!