Just ignorance on my part. I've never seen how you hone those, particularly how you would set the bevel angle. Curious now... shall Google...The same way... or have I misunderstood the question? The razors in question are a Rolls Razor with spare blade, and a Darwin Universal Hollow Ground with spare blade. I don't think I quite got either of these two running in their prime, and I'm certain both need reworking for best results. They'll need their spines taping, as the spines are elevated off the strops in their respective mechanisms, but otherwise they'll tootle back and forth on the stones to refresh them when their integral systems aren't quite keeping the best edge.