If the honing process results in a different wear rate of the spine versus the edge, then I think it is reasonable to assume that the bevel angle will change slightly each time the razor his honed. I recently bought a Hartsteel razor and the note that accompanied the razor said they recommend taping the spine during honing. The razor came shave ready and did give an excellent shave. If they used tape at the factory to set the initial bevel then I probably should continue to use tape every time I rehone it.