Sounds like the sector gear was not tight on the pivot (vertical) shaft splines. The gear and shaft should be rock solid together when the top nut is tight.
Quoting Removed, click Modern View to see
That says the upper bushing is shot. Presuming the bearing surface on the pivot shaft is not worn, replacing the upper bushing should eliminate the front-back movement of the pivot shaft/gear.
C&G sells the upper bushing singly. I bought one several years ago - seems it was around $20.
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Sounds like the thrust bearing and the lower bushing are in good shape. I'd leave both alone. Even a slightly worn lower bushing will not cause steering wobble - it's a worn upper bushing that causes most problems.
Quoting Removed, click Modern View to see
There's no seal above the lower bushing/thrust bearing. Could it be the seal at the bottom of the gear box dropped out and slid down the shaft?
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Reassembly is as easy as disassembly - probably easier(!). Just make sure the sector gear is TIGHT on the pivot shaft splines before you stick the cover back on!
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