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That is most likely cause of slippage, your going to struggle to get the clamp tight enough with a screwdiver.
Possibly the other way round - too much clamp force achievable with a flat head has buggered the 'rails'. The allen heads are tiny and it's very hard to put significant torque on them without rounding them.
The clamp design is 'clever clever' and as such is a bit shit really. If the bolt slackens off the whole thing falls apart and the bits vanish. And it's very hard to correct it out on the road with a multi-tool allen key.
Howard
@853Superfly
I do belive Chak's right.
never even noticed the screw driver flats.
That is most likely cause of slippage, your going to struggle to get the clamp tight enough with a screwdiver.
Just had a look for images.
looks like 4mm allen head bolts (what my older post uses too) with a washer.
easy to fix.
is this the bit where the forum reccomends you hammer frozen shit sausages into the lawn of the seller of the post you bought :)