Adjusting Ross Steering

On my Ross steering box there is a bolt with a jam nut. Is that a way to tighten up the box? If so how do you do it?
I am gathering needed parts for a P/S conversion but don't have everything yet.

 

Be sure to lift the front tires off the ground so you can cycle the box from lock-to-lock each time you make a **small** adjustment to the set screw. It doesn't take very much movement to make a big difference in feel. Go about a 1/4 turn at a time.

The first thing you'll notice is that the steering has a "hard spot" right in the center, when the wheels are pointed straight ahead. Back off a little from that point.

Also - some will tell you that you shouldn't adjust it at all b/c you can't possibly get it right without removing the box and having it on a bench. If you get it too tight, the box will wear out in short order b/c of the extra preload on the bearings.

I adjusted mine, but didn't notice any "real" difference. YMMV