Tacx Antares Rollers Question/Issue

I was brought a set of Tacx Antares for Christmas, assembled them no problems and jumped on for a ride, within a few minutes was riding fine and really enjoying them. Now after a few uses I have noticed that the frame for the rollers slips when I put the drive belt on one side of the rollers, one side is fine and I can use them , if I put the belt on the other side the tension clip doesn't hold and I slips back a few cm's.
I have contacted the online store I used, who have taken an age to get back to me (but it is just after Christmas so I'll let them off) but they are justing saying send it back at my own cost and they look at it and are not giving any advice.
Has anyone else had an issue like this, is the tension clip faulty or have I done something stupid (which is always possible). I have googled "issues with Antares" and found nothing which is a good thing, but making me think I've done something wrong.
I have contacted the online store I used, who have taken an age to get back to me (but it is just after Christmas so I'll let them off) but they are justing saying send it back at my own cost and they look at it and are not giving any advice.
Has anyone else had an issue like this, is the tension clip faulty or have I done something stupid (which is always possible). I have googled "issues with Antares" and found nothing which is a good thing, but making me think I've done something wrong.
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the lock leaver is closed properly and stop screw is the same as I can use rollers when the drive belt is on the other side. Although I can use the roller putting the belt on the other side I am a bit concerned if the frame is slipping now what will happen in a month or two.
They start off square then after two or three sessions they move. So effectively your riding at an angle. Your rear wheel is square to the frame but your front wheel is angled.
I just move it back after three sessions.
Thought it was just me
To be honest I like the idea of putting a pin through the frame to keep it in one place rather than send them back as its not easy for me to arrange to send them.
Just to say, I have no issues using them, they just slip on one side when I set them up.
The first set I rode that hard I melted the bearings, ha ha ha only kidding.
I lent them somebody and they kept them and gave me the money for them. Both sets have the same problem.
So not that long my friend
Just found myself googling this problem. Bit annoyed bacuase they're supposed to be a quality product.
Thought about a permanent fix by drilling and tapping but have tried a 'temporary' solution that seems to work.
Just slip a piece of folded paper between the fixing mech lever and the frame, it pads it out a bit and no longer slips. Just makes the grip a bit tighter. Not the ultimate solution but a cheap fix and less hassle than sending back etc.
(I folded a piece of small note paper a few times).
Hope that helps?
cheers,
N