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Pete,
If loosening the screws works then it could be misalignment problem.
When you relax the mechanicals by undoing the screws it can align by itself and the friction ceases.
Maybe check that the bracket and the focus drive are at the right angle with respect to each other and make sure that the centre of the focus shaft aligns with the centre of motor output shaft
If you think the shaft is bent - remove it and let it rotate and see if it wobbles
As for the direction problem, does this happen when its been relaxed or when its in its "stressed" state !
Its possible that maybe there is a poor connection somewhere too - not sure how the steppers might behave if they are missing a phase or having excessive resistance on a phase either intermittently or permanently.
Rally
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