Originally Posted by
Dan Burkhart
There is one more factor for straight pull which is spoke head offset. Usually a positive number which means it is added, but on rare occasions it can be a negative. The adjustment is made in the same way that half the spoke diameter is subtracted for J bend.
You are conflating two completely different kinds of "straightpull" and two different kinds of offset.
The straightpull in the OP refers to spokes that are laced with no flange offset.
But you are referring to spokes that have no elbow, the opposite of J bend.
Some straightpull laced hubs use straightpull spokes, some offset lacing hubs use straightpull spokes, and most J-bend hubs can be laced offset or straightpull. Straightpull spoke hubs generally are good for a single lacing angle/cross (e.g. straight or 2 cross). While J bend hubs will usually let you lace them the straight, 1x, 2x, 3x etc. I think there is also a lacing between straight and 1x.
The offset in your diagram is more like a flange diameter issue, but really you have to deal with it directly by correcting the product of the calculation as you would for added nipple washers.