rear wheel and chain adjustment query

[midden]

The screwdriver (or rag as someone else suggested) pulls the whole wheel forward.  Granted its mainly on the drive side but it should be enough to pull both sides up to the stops.  If it isn't, or you find the final torque is pulling it out then I would suggest something else might be amiss. 

I can certainly see the logic in the screwdriver method and if spindle,washers and frame being straight should come in to line at final torque.
Perhaps give the method another try MC without keeping a check on the other side until you've tightened to proper torque.