Massey-Harris 444 Steering Play

I removed the grill to take a look at the steering gear area. The worm gear has an adjusting screw, which is locked in place with a locknut. I discovered that I can turn the locknut with my fingers. I wanted to tighten the adjusting screw, but there is not enough room for a screwdriver: only about 7/8" between the screw and the frame casting in front of it.

I see that Harbor Freight Tools sells a right angle screwdriver that requires only 1" of clearance. But I think 1" is too wide. What should I do? Did they really make these tractors that difficult to service?

The steering shaft is loose down near where it enters the steering gear box, so I'm thinking that the roller bearing at the end of the shaft is being ground up. Should I remove those 4 bolts that cover the end of the shaft? It looks like it would be very difficult to reach the lower 2 with a wrench. Would it be easier to remove the whole steering gear box? Would I have to raise the front end of the tractor off the ground?

In your recommendation to make your own screwdriver out of metal, did you mean to use 1 piece of metal or 2 pieces? Thanks again, Marlowe.