Its about 1mm off tightened down.
Tbh I'm finding the screws very tight and was worried it was going to let go at some point.
The allen key book I'm using is a decent quality one, and the fit was nice and tight, just the hex gave way on the head.
To be honest I'm not convinced that putting a slot in it would work either as its REALLY tight, even though its not tightened down.
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