the reason i took the box apart was because the steering shaft was broke , both the bottom and top bearings , didn't look good so i thouht it would be wise to replace them , so i did new bearings seals i even replaced the flat head bolts for adjusting ,i m thinking that the worm gear shaft dropped and the top bearing got out of the race , and when i turned my wheel the other way the shaft came up and pinched the bearing ,after that happened , i didn't have any bearings , so i put that nylon part in so i could try and find out why the shaft was moving , i was turning my wheel back and forth , keep in mind i don't have any shims now and the shaft still moves up and down , i was starting to get upset when my wife said it won't turn , so i freaked out and just quit , i don't plan to leave the nylon in i just feel safer with it there ,the right sector shaft is good , but the left one is wore out , i have been working on this tractor fixing leaks and i am feeling that im spending too much money on it .