The steering column appears to have a bevel gear on the end of it, and it mates with a small sector, not a full gear. The sector seems to be welded to the shaft that carries the drag lever:
[Linked Image]

So, you could rotate the steering column gear to a different position, but there isn't much you can do about the sector except make sure both steering column and sector pivot shaft have good tight bushes.

Also, what seem to be the lock stops that control how far the stub axles turn, are welded to the tie rod:
[Linked Image]

If the tie rod is straight and its pivots are not worn, adjustment of lock stops seems to involve welding up or grinding away the projections from the tie rod.

The problem may be wear, or bent and mangled steering linkage. Unless the bevel gears are damaged though, anything else should be very easy to fix.