there's a guy called craig jackson on here who does servicing, i'll dig out his details and post them.
He does the best job he can but he has limited spares. he does have guide blocks but on mine for example the guide blocks and the black outer sleeve have worn, so replacing the guide blocks has helped but there is still considerable play there.
As someone says, pi$$ poor. I really like the freedom that these type of seatposts bring, thing is they all have faults it seems, and picking another is a gamble as you only know problems 12 months down the line and then the warranty is non existent and repair costs seem to be eye watering