Wheelbuilding / Wheel Building / Wheel build help

I don't really know myself either, but Sheldon says something about left or right drilling determining whether you start lacing from the first or second hole from the valve. I think it supposed to affect the spoke angles? I asked a wheelbuilder to check one of the wheels I laced last week, and he reckoned the angles were off because I should have started one hole further round because of the drilling. Its a mavic open sport I used, which the internets would have me believe is a left handed rim, but I can't see any pattern myself...

I see what you mean now. I must admitt I was'nt aware of a standard for the way the offset angles alternate. so no, of course turning the rim over is'nt going to do anything.

You could thread sokes through adjacent holes and press the nipple shoulders plush against the inside of the drilling. The see the difference in direction of the spokes I suppose.

If you get it wrong the spoke angles will be that same, but the nipples will not be as well seated.