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Also if the rim is directional drilled and its1:1 lacing you cant lace the rim the wrong way round. Which ever way you start with the valve hole correctly boxed will be the right way or I have been very lucky over the last few years.
When I first started building wheels this did confuse me till I tried lacing the wheel the other way and found it was always right.
With 2:1 lacing there is right and wrong way to lace the rim.
cycleclinic
luft
I have a no name carbon rim that has apparently been laced, but not ridden. Looking very closely, I can see very slight bulges at some of the spoke holes (hub side). It also looks as thought the spoke holes have been drilled directionally (is this a thing?) as they are staggered ever so slightly left to right of the centre line, but they all leave the rim towards the hub in the centre.
I suspect they may have been laced the wrong way (ie the spokes to right flange in holes intended for left flange).
How likely is that? Also, is it worth building the rim up, or is it a non starter? I'll try and get a good pic of what I mean.