Hi Vince,
Suggest you wind in both adjusters, if you have the drum off you can or should see this happen, as the bottom shoe pin (for want of a better word) goes in and as does the top shoe pin.
With the drum fitted, wind out (clockwise) the adjuster which is the outer square of the two adjusters until the shoe contacts the drum, then wind in again clockwise the hex bolt head (or inner adjuster head) until the opposing shoe contacts the drum. Then tweak both as required.
There is generally some small free play in the wheel if its off the road and the amount of wheel rock can determine if the shoe is in contact with the drum, the correct way is to jack up the vehicle completely off the ground or at least one side in turn,
It is possible to mal-adjust the brakes such that only one shoe contacts the drum, it is also possible again through maladjustment to damage the adjuster, the damage can be seen with the drum off if one observes how it works.
When all wheel brakes have been adjusted the next move is to adjust the linkage such that when the handbrake is pulled equally on all 4 drums so they lock together. This is best done with the escape hatches off as the to do this adjusters for the rear wheels are under the battery boxes. The front wheel adjusters are easily accessible inside the vehicle from the drivers seat.
Diana