>>1648577the pic in the bottom left shows the right orientation for use on the lower crown race
as for the lock nut I would not worry too much about it, the normal threaded type comes loose quite often
one way to check for this is to flip the bike vertically so that it rests on its rear wheel, apply the rear brake and pull up and down on the handle bar
the upper crown race is adjustable up and down on the threaded section of the steering tube
with the normal set up its ok to run this slightly loose, as the lock nut adds extra loading to the bearing anyway
when fully tighten down there should be only just enough play so that the bearing can run smoothly
the difference between too tight and tight enough is very small
yours you just have to set the right load with the crown race, and from there tightening the clamp bolt should have no significant effect on the adjustment
normal stuff is to clean the ball bearings and visually inspect for dents or chips in the surface
some people also measure the bearing diameter to see if it needs replacing but for normal purposes this is over kill
