no probs, martin.
it fits exactly the same way as a normal smoothing/jack and truing plane, only that they are large enough to take a capping iron.
the spoke shave isn't so has the backing iron with the scew to hold it to do the same job as the capping iron.
Also, I don'tknow which type you have, whether it's the flat soled or the rounded soled shave, but what the old wheel rights used to do was use the flat soled shave with a perfectly straight sharpened blade,for shaving good and straight cuts in the spokes, but the curved soled shave blade was honed with a very slightly eliptical curve to the cutting edge.
This is the one I use mostly for shaping and carving as it goes around curves better than the flat one.hope this isn't too intense, but it helps to know your tools, ( so to speak)